diff --git a/CHANGELOG.md b/CHANGELOG.md
index d350f6a58..227776dc9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Unversioned
 
+- Major: Added username autocompletion popup menu when typing usernames with an @ prefix. (#1979, #2866)
 - Major: Added ability to toggle visibility of Channel Tabs - This can be done by right-clicking the tab area or pressing the keyboard shortcut (default: Ctrl+U). (#2600)
 - Minor: Restore automod functionality for moderators (#2817, #2887)
 - Minor: Add setting for username style (#2889, #2891)
diff --git a/chatterino.pro b/chatterino.pro
index 2dfee10d3..7cdba86a0 100644
--- a/chatterino.pro
+++ b/chatterino.pro
@@ -318,8 +318,8 @@ SOURCES += \
     src/widgets/settingspages/NotificationPage.cpp \
     src/widgets/settingspages/SettingsPage.cpp \
     src/widgets/splits/ClosedSplits.cpp \
-    src/widgets/splits/EmoteInputItem.cpp \
-    src/widgets/splits/EmoteInputPopup.cpp \
+    src/widgets/splits/InputCompletionItem.cpp \
+    src/widgets/splits/InputCompletionPopup.cpp \
     src/widgets/splits/Split.cpp \
     src/widgets/splits/SplitContainer.cpp \
     src/widgets/splits/SplitHeader.cpp \
@@ -579,8 +579,8 @@ HEADERS += \
     src/widgets/settingspages/NotificationPage.hpp \
     src/widgets/settingspages/SettingsPage.hpp \
     src/widgets/splits/ClosedSplits.hpp \
-    src/widgets/splits/EmoteInputItem.hpp \
-    src/widgets/splits/EmoteInputPopup.hpp \
+    src/widgets/splits/InputCompletionItem.hpp \
+    src/widgets/splits/InputCompletionPopup.hpp \
     src/widgets/splits/Split.hpp \
     src/widgets/splits/SplitContainer.hpp \
     src/widgets/splits/SplitHeader.hpp \
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index aa3f8654c..9061840d1 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -437,10 +437,10 @@ set(SOURCE_FILES
 
         widgets/splits/ClosedSplits.cpp
         widgets/splits/ClosedSplits.hpp
-        widgets/splits/EmoteInputItem.cpp
-        widgets/splits/EmoteInputItem.hpp
-        widgets/splits/EmoteInputPopup.cpp
-        widgets/splits/EmoteInputPopup.hpp
+        widgets/splits/InputCompletionItem.cpp
+        widgets/splits/InputCompletionItem.hpp
+        widgets/splits/InputCompletionPopup.cpp
+        widgets/splits/InputCompletionPopup.hpp
         widgets/splits/Split.cpp
         widgets/splits/Split.hpp
         widgets/splits/SplitContainer.cpp
diff --git a/src/singletons/Settings.hpp b/src/singletons/Settings.hpp
index ffb6815d9..808e7656b 100644
--- a/src/singletons/Settings.hpp
+++ b/src/singletons/Settings.hpp
@@ -171,6 +171,8 @@ public:
         "/behaviour/autocompletion/userCompletionOnlyWithAt", false};
     BoolSetting emoteCompletionWithColon = {
         "/behaviour/autocompletion/emoteCompletionWithColon", true};
+    BoolSetting showUsernameCompletionMenu = {
+        "/behaviour/autocompletion/showUsernameCompletionMenu", true};
 
     FloatSetting pauseOnHoverDuration = {"/behaviour/pauseOnHoverDuration", 0};
     EnumSetting<Qt::KeyboardModifier> pauseChatModifier = {
diff --git a/src/widgets/settingspages/GeneralPage.cpp b/src/widgets/settingspages/GeneralPage.cpp
index 5d96e9ac5..275744493 100644
--- a/src/widgets/settingspages/GeneralPage.cpp
+++ b/src/widgets/settingspages/GeneralPage.cpp
@@ -612,6 +612,8 @@ void GeneralPage::initLayout(GeneralPageView &layout)
     layout.addCheckbox("Color @usernames", s.colorUsernames);
     layout.addCheckbox("Try to find usernames without @ prefix",
                        s.findAllUsernames);
+    layout.addCheckbox("Show username autocompletion popup menu",
+                       s.showUsernameCompletionMenu);
     const QStringList usernameDisplayModes = {"Username", "Localized name",
                                               "Username and localized name"};
 
diff --git a/src/widgets/splits/EmoteInputItem.cpp b/src/widgets/splits/EmoteInputItem.cpp
deleted file mode 100644
index 5612b16cd..000000000
--- a/src/widgets/splits/EmoteInputItem.cpp
+++ /dev/null
@@ -1,63 +0,0 @@
-#include "EmoteInputItem.hpp"
-
-namespace chatterino {
-
-EmoteInputItem::EmoteInputItem(const EmotePtr &emote, const QString &text,
-                               ActionCallback action)
-    : emote_(emote)
-    , text_(text)
-    , action_(action)
-{
-}
-
-void EmoteInputItem::action()
-{
-    if (this->action_ && this->emote_)
-        this->action_(this->emote_->name.string);
-}
-
-void EmoteInputItem::paint(QPainter *painter, const QRect &rect) const
-{
-    painter->setRenderHint(QPainter::SmoothPixmapTransform);
-    painter->setRenderHint(QPainter::Antialiasing);
-
-    auto margin = 4;
-    auto imageHeight = ICON_SIZE.height() - margin * 2;
-
-    QRect iconRect{
-        rect.topLeft() + QPoint{margin, margin},
-        QSize{imageHeight, imageHeight},
-    };
-
-    if (this->emote_)
-    {
-        if (auto image = this->emote_->images.getImage(2))
-        {
-            if (auto pixmap = image->pixmapOrLoad())
-            {
-                if (image->height() != 0)
-                {
-                    auto aspectRatio =
-                        double(image->width()) / double(image->height());
-
-                    iconRect = {
-                        rect.topLeft() + QPoint{margin, margin},
-                        QSize(int(imageHeight * aspectRatio), imageHeight)};
-                    painter->drawPixmap(iconRect, *pixmap);
-                }
-            }
-        }
-    }
-
-    QRect textRect =
-        QRect(iconRect.topRight() + QPoint{margin, 0},
-              QSize(rect.width() - iconRect.width(), iconRect.height()));
-    painter->drawText(textRect, Qt::AlignLeft | Qt::AlignVCenter, this->text_);
-}
-
-QSize EmoteInputItem::sizeHint(const QRect &rect) const
-{
-    return QSize(rect.width(), ICON_SIZE.height());
-}
-
-}  // namespace chatterino
diff --git a/src/widgets/splits/InputCompletionItem.cpp b/src/widgets/splits/InputCompletionItem.cpp
new file mode 100644
index 000000000..99994b605
--- /dev/null
+++ b/src/widgets/splits/InputCompletionItem.cpp
@@ -0,0 +1,76 @@
+#include "InputCompletionItem.hpp"
+
+namespace chatterino {
+
+InputCompletionItem::InputCompletionItem(const EmotePtr &emote,
+                                         const QString &text,
+                                         ActionCallback action)
+    : emote_(emote)
+    , text_(text)
+    , action_(action)
+{
+}
+
+void InputCompletionItem::action()
+{
+    if (this->action_)
+    {
+        if (this->emote_)
+            this->action_(this->emote_->name.string);
+        else
+            this->action_(this->text_);
+    }
+}
+
+void InputCompletionItem::paint(QPainter *painter, const QRect &rect) const
+{
+    auto margin = 4;
+    QRect textRect;
+    if (this->emote_)
+    {
+        painter->setRenderHint(QPainter::SmoothPixmapTransform);
+        painter->setRenderHint(QPainter::Antialiasing);
+
+        auto imageHeight = ICON_SIZE.height() - margin * 2;
+
+        QRect iconRect{
+            rect.topLeft() + QPoint{margin, margin},
+            QSize{imageHeight, imageHeight},
+        };
+
+        if (auto image = this->emote_->images.getImage(2))
+        {
+            if (auto pixmap = image->pixmapOrLoad())
+            {
+                if (image->height() != 0)
+                {
+                    auto aspectRatio =
+                        double(image->width()) / double(image->height());
+
+                    iconRect = {
+                        rect.topLeft() + QPoint{margin, margin},
+                        QSize(int(imageHeight * aspectRatio), imageHeight)};
+                    painter->drawPixmap(iconRect, *pixmap);
+                }
+            }
+        }
+
+        textRect =
+            QRect(iconRect.topRight() + QPoint{margin, 0},
+                  QSize(rect.width() - iconRect.width(), iconRect.height()));
+    }
+    else
+    {
+        textRect = QRect(rect.topLeft() + QPoint{margin, 0},
+                         QSize(rect.width(), rect.height()));
+    }
+
+    painter->drawText(textRect, Qt::AlignLeft | Qt::AlignVCenter, this->text_);
+}
+
+QSize InputCompletionItem::sizeHint(const QRect &rect) const
+{
+    return QSize(rect.width(), ICON_SIZE.height());
+}
+
+}  // namespace chatterino
diff --git a/src/widgets/splits/EmoteInputItem.hpp b/src/widgets/splits/InputCompletionItem.hpp
similarity index 76%
rename from src/widgets/splits/EmoteInputItem.hpp
rename to src/widgets/splits/InputCompletionItem.hpp
index d0798c2ea..9ea1260a1 100644
--- a/src/widgets/splits/EmoteInputItem.hpp
+++ b/src/widgets/splits/InputCompletionItem.hpp
@@ -6,13 +6,13 @@
 
 namespace chatterino {
 
-class EmoteInputItem : public GenericListItem
+class InputCompletionItem : public GenericListItem
 {
     using ActionCallback = std::function<void(const QString &)>;
 
 public:
-    EmoteInputItem(const EmotePtr &emote, const QString &text,
-                   ActionCallback action);
+    InputCompletionItem(const EmotePtr &emote, const QString &text,
+                        ActionCallback action);
 
     // GenericListItem interface
 public:
diff --git a/src/widgets/splits/EmoteInputPopup.cpp b/src/widgets/splits/InputCompletionPopup.cpp
similarity index 76%
rename from src/widgets/splits/EmoteInputPopup.cpp
rename to src/widgets/splits/InputCompletionPopup.cpp
index 2291afe6a..689aa1c8a 100644
--- a/src/widgets/splits/EmoteInputPopup.cpp
+++ b/src/widgets/splits/InputCompletionPopup.cpp
@@ -1,4 +1,4 @@
-#include "EmoteInputPopup.hpp"
+#include "InputCompletionPopup.hpp"
 
 #include "Application.hpp"
 #include "controllers/accounts/AccountController.hpp"
@@ -10,7 +10,7 @@
 #include "singletons/Emotes.hpp"
 #include "util/LayoutCreator.hpp"
 #include "widgets/listview/GenericListView.hpp"
-#include "widgets/splits/EmoteInputItem.hpp"
+#include "widgets/splits/InputCompletionItem.hpp"
 
 namespace chatterino {
 namespace {
@@ -41,7 +41,7 @@ namespace {
     }
 }  // namespace
 
-EmoteInputPopup::EmoteInputPopup(QWidget *parent)
+InputCompletionPopup::InputCompletionPopup(QWidget *parent)
     : BasePopup({BasePopup::EnableCustomFrame, BasePopup::Frameless,
                  BasePopup::DontFocus},
                 parent)
@@ -56,7 +56,7 @@ EmoteInputPopup::EmoteInputPopup(QWidget *parent)
     this->redrawTimer_.setInterval(33);
 }
 
-void EmoteInputPopup::initLayout()
+void InputCompletionPopup::initLayout()
 {
     LayoutCreator creator = {this};
 
@@ -71,7 +71,7 @@ void EmoteInputPopup::initLayout()
                      });
 }
 
-void EmoteInputPopup::updateEmotes(const QString &text, ChannelPtr channel)
+void InputCompletionPopup::updateEmotes(const QString &text, ChannelPtr channel)
 {
     std::vector<_Emote> emotes;
     auto tc = dynamic_cast<TwitchChannel *>(channel.get());
@@ -122,11 +122,11 @@ void EmoteInputPopup::updateEmotes(const QString &text, ChannelPtr channel)
     int count = 0;
     for (auto &&emote : emotes)
     {
-        this->model_.addItem(std::make_unique<EmoteInputItem>(
+        this->model_.addItem(std::make_unique<InputCompletionItem>(
             emote.emote, emote.displayName + " - " + emote.providerName,
             this->callback_));
 
-        if (count++ == maxEmoteCount)
+        if (count++ == maxEntryCount)
             break;
     }
 
@@ -136,22 +136,45 @@ void EmoteInputPopup::updateEmotes(const QString &text, ChannelPtr channel)
     }
 }
 
-bool EmoteInputPopup::eventFilter(QObject *watched, QEvent *event)
+void InputCompletionPopup::updateUsers(const QString &text, ChannelPtr channel)
+{
+    auto twitchChannel = dynamic_cast<TwitchChannel *>(channel.get());
+    if (twitchChannel)
+    {
+        auto chatters = twitchChannel->accessChatters()->filterByPrefix(text);
+        this->model_.clear();
+        int count = 0;
+        for (const auto &name : chatters)
+        {
+            this->model_.addItem(std::make_unique<InputCompletionItem>(
+                nullptr, name, this->callback_));
+
+            if (count++ == maxEntryCount)
+                break;
+        }
+        if (!chatters.empty())
+        {
+            this->ui_.listView->setCurrentIndex(this->model_.index(0));
+        }
+    }
+}
+
+bool InputCompletionPopup::eventFilter(QObject *watched, QEvent *event)
 {
     return this->ui_.listView->eventFilter(watched, event);
 }
 
-void EmoteInputPopup::setInputAction(ActionCallback callback)
+void InputCompletionPopup::setInputAction(ActionCallback callback)
 {
     this->callback_ = std::move(callback);
 }
 
-void EmoteInputPopup::showEvent(QShowEvent *)
+void InputCompletionPopup::showEvent(QShowEvent *)
 {
     this->redrawTimer_.start();
 }
 
-void EmoteInputPopup::hideEvent(QHideEvent *)
+void InputCompletionPopup::hideEvent(QHideEvent *)
 {
     this->redrawTimer_.stop();
 }
diff --git a/src/widgets/splits/EmoteInputPopup.hpp b/src/widgets/splits/InputCompletionPopup.hpp
similarity index 78%
rename from src/widgets/splits/EmoteInputPopup.hpp
rename to src/widgets/splits/InputCompletionPopup.hpp
index 1d8c7e735..6329a8a64 100644
--- a/src/widgets/splits/EmoteInputPopup.hpp
+++ b/src/widgets/splits/InputCompletionPopup.hpp
@@ -9,16 +9,17 @@ namespace chatterino {
 
 class GenericListView;
 
-class EmoteInputPopup : public BasePopup
+class InputCompletionPopup : public BasePopup
 {
     using ActionCallback = std::function<void(const QString &)>;
 
-    constexpr static int maxEmoteCount = 200;
+    constexpr static int maxEntryCount = 200;
 
 public:
-    EmoteInputPopup(QWidget *parent = nullptr);
+    InputCompletionPopup(QWidget *parent = nullptr);
 
     void updateEmotes(const QString &text, ChannelPtr channel);
+    void updateUsers(const QString &text, ChannelPtr channel);
     virtual bool eventFilter(QObject *, QEvent *event) override;
 
     void setInputAction(ActionCallback callback);
diff --git a/src/widgets/splits/SplitInput.cpp b/src/widgets/splits/SplitInput.cpp
index f9fbb6f53..91be55d62 100644
--- a/src/widgets/splits/SplitInput.cpp
+++ b/src/widgets/splits/SplitInput.cpp
@@ -15,7 +15,7 @@
 #include "widgets/helper/ChannelView.hpp"
 #include "widgets/helper/EffectLabel.hpp"
 #include "widgets/helper/ResizingTextEdit.hpp"
-#include "widgets/splits/EmoteInputPopup.hpp"
+#include "widgets/splits/InputCompletionPopup.hpp"
 #include "widgets/splits/Split.hpp"
 #include "widgets/splits/SplitContainer.hpp"
 #include "widgets/splits/SplitInput.hpp"
@@ -45,7 +45,7 @@ SplitInput::SplitInput(Split *_chatWidget)
     // misc
     this->installKeyPressedEvent();
     this->ui_.textEdit->focusLost.connect([this] {
-        this->hideColonMenu();
+        this->hideCompletionPopup();
     });
     this->scaleChangedEvent(this->scale());
 }
@@ -202,7 +202,7 @@ void SplitInput::installKeyPressedEvent()
     auto app = getApp();
 
     this->ui_.textEdit->keyPressed.connect([this, app](QKeyEvent *event) {
-        if (auto popup = this->emoteInputPopup_.get())
+        if (auto popup = this->inputCompletionPopup_.get())
         {
             if (popup->isVisible())
             {
@@ -451,26 +451,30 @@ void SplitInput::installKeyPressedEvent()
 
 void SplitInput::onTextChanged()
 {
-    this->updateColonMenu();
+    this->updateCompletionPopup();
 }
 
 void SplitInput::onCursorPositionChanged()
 {
-    this->updateColonMenu();
+    this->updateCompletionPopup();
 }
 
-void SplitInput::updateColonMenu()
+void SplitInput::updateCompletionPopup()
 {
     auto channel = this->split_->getChannel().get();
-    if (!getSettings()->emoteCompletionWithColon ||
-        (!dynamic_cast<TwitchChannel *>(channel) &&
-         !(channel->getType() == Channel::Type::TwitchWhispers)))
+    auto tc = dynamic_cast<TwitchChannel *>(channel);
+    bool showEmoteCompletion =
+        getSettings()->emoteCompletionWithColon &&
+        (tc || (channel->getType() == Channel::Type::TwitchWhispers));
+    bool showUsernameCompletion =
+        tc && getSettings()->showUsernameCompletionMenu;
+    if (!showEmoteCompletion && !showUsernameCompletion)
     {
-        this->hideColonMenu();
+        this->hideCompletionPopup();
         return;
     }
 
-    // check if in :
+    // check if in completion prefix
     auto &edit = *this->ui_.textEdit;
 
     auto text = edit.toPlainText();
@@ -478,7 +482,7 @@ void SplitInput::updateColonMenu()
 
     if (text.length() == 0)
     {
-        this->hideColonMenu();
+        this->hideCompletionPopup();
         return;
     }
 
@@ -486,41 +490,54 @@ void SplitInput::updateColonMenu()
     {
         if (text[i] == ' ')
         {
-            this->hideColonMenu();
+            this->hideCompletionPopup();
             return;
         }
-        else if (text[i] == ':')
+        else if (text[i] == ':' && showEmoteCompletion)
         {
             if (i == 0 || text[i - 1].isSpace())
-                this->showColonMenu(text.mid(i, position - i + 1).mid(1));
+                this->showCompletionPopup(text.mid(i, position - i + 1).mid(1),
+                                          true);
             else
-                this->hideColonMenu();
+                this->hideCompletionPopup();
+            return;
+        }
+        else if (text[i] == '@' && showUsernameCompletion)
+        {
+            if (i == 0 || text[i - 1].isSpace())
+                this->showCompletionPopup(text.mid(i, position - i + 1).mid(1),
+                                          false);
+            else
+                this->hideCompletionPopup();
             return;
         }
     }
 
-    this->hideColonMenu();
+    this->hideCompletionPopup();
 }
 
-void SplitInput::showColonMenu(const QString &text)
+void SplitInput::showCompletionPopup(const QString &text, bool emoteCompletion)
 {
-    if (!this->emoteInputPopup_.get())
+    if (!this->inputCompletionPopup_.get())
     {
-        this->emoteInputPopup_ = new EmoteInputPopup(this);
-        this->emoteInputPopup_->setInputAction(
+        this->inputCompletionPopup_ = new InputCompletionPopup(this);
+        this->inputCompletionPopup_->setInputAction(
             [that = QObjectRef(this)](const QString &text) mutable {
                 if (auto this2 = that.get())
                 {
-                    this2->insertColonText(text);
-                    this2->hideColonMenu();
+                    this2->insertCompletionText(text);
+                    this2->hideCompletionPopup();
                 }
             });
     }
 
-    auto popup = this->emoteInputPopup_.get();
+    auto popup = this->inputCompletionPopup_.get();
     assert(popup);
 
-    popup->updateEmotes(text, this->split_->getChannel());
+    if (emoteCompletion)  // autocomplete emotes
+        popup->updateEmotes(text, this->split_->getChannel());
+    else  // autocomplete usernames
+        popup->updateUsers(text, this->split_->getChannel());
 
     auto pos = this->mapToGlobal({0, 0}) - QPoint(0, popup->height()) +
                QPoint((this->width() - popup->width()) / 2, 0);
@@ -529,13 +546,13 @@ void SplitInput::showColonMenu(const QString &text)
     popup->show();
 }
 
-void SplitInput::hideColonMenu()
+void SplitInput::hideCompletionPopup()
 {
-    if (auto popup = this->emoteInputPopup_.get())
+    if (auto popup = this->inputCompletionPopup_.get())
         popup->hide();
 }
 
-void SplitInput::insertColonText(const QString &input_)
+void SplitInput::insertCompletionText(const QString &input_)
 {
     auto &edit = *this->ui_.textEdit;
     auto input = input_ + ' ';
@@ -545,10 +562,21 @@ void SplitInput::insertColonText(const QString &input_)
 
     for (int i = clamp(position, 0, text.length() - 1); i >= 0; i--)
     {
+        bool done = false;
         if (text[i] == ':')
         {
-            auto cursor = edit.textCursor();
+            done = true;
+        }
+        else if (text[i] == '@')
+        {
+            input = "@" + input_ +
+                    (getSettings()->mentionUsersWithComma ? ", " : " ");
+            done = true;
+        }
 
+        if (done)
+        {
+            auto cursor = edit.textCursor();
             edit.setText(text.remove(i, position - i).insert(i, input));
 
             cursor.setPosition(i + input.size());
diff --git a/src/widgets/splits/SplitInput.hpp b/src/widgets/splits/SplitInput.hpp
index 7e97aa6e3..52e9b015d 100644
--- a/src/widgets/splits/SplitInput.hpp
+++ b/src/widgets/splits/SplitInput.hpp
@@ -16,7 +16,7 @@ namespace chatterino {
 
 class Split;
 class EmotePopup;
-class EmoteInputPopup;
+class InputCompletionPopup;
 class EffectLabel;
 class ResizingTextEdit;
 
@@ -48,15 +48,15 @@ private:
     void onCursorPositionChanged();
     void onTextChanged();
     void updateEmoteButton();
-    void updateColonMenu();
-    void showColonMenu(const QString &text);
-    void hideColonMenu();
-    void insertColonText(const QString &text);
+    void updateCompletionPopup();
+    void showCompletionPopup(const QString &text, bool emoteCompletion);
+    void hideCompletionPopup();
+    void insertCompletionText(const QString &text);
     void openEmotePopup();
 
     Split *const split_;
     QObjectRef<EmotePopup> emotePopup_;
-    QObjectRef<EmoteInputPopup> emoteInputPopup_;
+    QObjectRef<InputCompletionPopup> inputCompletionPopup_;
 
     struct {
         ResizingTextEdit *textEdit;