diff --git a/lib/bottom_sheet/multi_select_bottom_sheet.dart b/lib/bottom_sheet/multi_select_bottom_sheet.dart
index 26d797f..94dc05e 100644
--- a/lib/bottom_sheet/multi_select_bottom_sheet.dart
+++ b/lib/bottom_sheet/multi_select_bottom_sheet.dart
@@ -24,12 +24,18 @@ class MultiSelectBottomSheet<T> extends StatefulWidget
   /// Toggles search functionality.
   final bool searchable;
 
+  /// Toggles select all functionality. Default is false.
+  final bool selectAll;
+
   /// Text on the confirm button.
   final Text? confirmText;
 
   /// Text on the cancel button.
   final Text? cancelText;
 
+  /// Text on the select all button, if enabled.
+  final Text? selectAllText;
+
   /// An enum that determines which type of list to render.
   final MultiSelectListType? listType;
 
@@ -88,7 +94,9 @@ class MultiSelectBottomSheet<T> extends StatefulWidget
     this.listType,
     this.cancelText,
     this.confirmText,
+    this.selectAllText,
     this.searchable = false,
+    this.selectAll = false,
     this.selectedColor,
     this.initialChildSize,
     this.minChildSize,
@@ -155,14 +163,8 @@ class _MultiSelectBottomSheetState<T> extends State<MultiSelectBottomSheet<T>> {
         controlAffinity: ListTileControlAffinity.leading,
         onChanged: (checked) {
           setState(() {
-            _selectedValues = widget.onItemCheckedChange(
-                _selectedValues, item.value, checked!);
+            _setSelectedState(item, checked!);
 
-            if (checked) {
-              item.selected = true;
-            } else {
-              item.selected = false;
-            }
             if (widget.separateSelectedItems) {
               _items = widget.separateSelected(_items);
             }
@@ -203,14 +205,8 @@ class _MultiSelectBottomSheetState<T> extends State<MultiSelectBottomSheet<T>> {
         ),
         selected: item.selected,
         onSelected: (checked) {
-          if (checked) {
-            item.selected = true;
-          } else {
-            item.selected = false;
-          }
           setState(() {
-            _selectedValues = widget.onItemCheckedChange(
-                _selectedValues, item.value, checked);
+            _setSelectedState(item, checked);
           });
           if (widget.onSelectionChanged != null) {
             widget.onSelectionChanged!(_selectedValues);
@@ -220,6 +216,24 @@ class _MultiSelectBottomSheetState<T> extends State<MultiSelectBottomSheet<T>> {
     );
   }
 
+  void _setSelectedState(MultiSelectItem item, bool checked) {
+    _selectedValues =
+        widget.onItemCheckedChange(_selectedValues, item.value, checked);
+
+    if (checked) {
+      item.selected = true;
+    } else {
+      item.selected = false;
+    }
+  }
+
+  void _selectAll(bool checked) {
+    _items.forEach((item) => _setSelectedState(item, checked));
+    if (widget.onSelectionChanged != null) {
+      widget.onSelectionChanged!(_selectedValues);
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return Container(
@@ -344,6 +358,26 @@ class _MultiSelectBottomSheetState<T> extends State<MultiSelectBottomSheet<T>> {
                       ),
                     ),
                     SizedBox(width: 10),
+                    if (widget.selectAll)
+                      Expanded(
+                        child: TextButton(
+                          onPressed: () {
+                            setState(() => _selectAll(true));
+                          },
+                          child: widget.selectAllText ??
+                              Text(
+                                "SELECT ALL",
+                                style: TextStyle(
+                                  color: (widget.selectedColor != null &&
+                                      widget.selectedColor !=
+                                          Colors.transparent)
+                                      ? widget.selectedColor!.withOpacity(1)
+                                      : Theme.of(context).primaryColor,
+                                ),
+                              ),
+                        ),
+                      ),
+                    if (widget.selectAll) SizedBox(width: 10),
                     Expanded(
                       child: TextButton(
                         onPressed: () {
diff --git a/lib/bottom_sheet/multi_select_bottom_sheet_field.dart b/lib/bottom_sheet/multi_select_bottom_sheet_field.dart
index 8a1cf46..aed3d7c 100644
--- a/lib/bottom_sheet/multi_select_bottom_sheet_field.dart
+++ b/lib/bottom_sheet/multi_select_bottom_sheet_field.dart
@@ -35,12 +35,18 @@ class MultiSelectBottomSheetField<V> extends FormField<List<V>> {
   /// Toggles search functionality.
   final bool searchable;
 
+  /// Toggles select all functionality. Default is false.
+  final bool selectAll;
+
   /// Text on the confirm button.
   final Text? confirmText;
 
   /// Text on the cancel button.
   final Text? cancelText;
 
+  /// Text on the select all button, if enabled.
+  final Text? selectAllText;
+
   /// An enum that determines which type of list to render.
   final MultiSelectListType? listType;
 
@@ -121,8 +127,10 @@ class MultiSelectBottomSheetField<V> extends FormField<List<V>> {
     this.chipDisplay,
     this.initialValue,
     this.searchable = false,
+    this.selectAll = false,
     this.confirmText,
     this.cancelText,
+    this.selectAllText,
     this.selectedColor,
     this.initialChildSize,
     this.minChildSize,
@@ -181,6 +189,8 @@ class MultiSelectBottomSheetField<V> extends FormField<List<V>> {
                 searchHint: searchHint,
                 searchTextStyle: searchTextStyle,
                 searchable: searchable,
+                selectAll: selectAll,
+                selectAllText: selectAllText,
                 selectedColor: selectedColor,
                 separateSelectedItems: separateSelectedItems,
                 shape: shape,
@@ -202,8 +212,10 @@ class _MultiSelectBottomSheetFieldView<V> extends StatefulWidget {
   final void Function(List<V>)? onSelectionChanged;
   final void Function(List<V>)? onConfirm;
   final bool searchable;
+  final bool selectAll;
   final Text? confirmText;
   final Text? cancelText;
+  final Text? selectAllText;
   final MultiSelectListType? listType;
   final Color? selectedColor;
   final String? searchHint;
@@ -238,8 +250,10 @@ class _MultiSelectBottomSheetFieldView<V> extends StatefulWidget {
     this.chipDisplay,
     this.initialValue,
     this.searchable = false,
+    this.selectAll = false,
     this.confirmText,
     this.cancelText,
+    this.selectAllText,
     this.selectedColor,
     this.initialChildSize,
     this.minChildSize,
@@ -274,8 +288,10 @@ class _MultiSelectBottomSheetFieldView<V> extends StatefulWidget {
         chipDisplay = field.chipDisplay,
         initialValue = field.initialValue,
         searchable = field.searchable,
+        selectAll = field.selectAll,
         confirmText = field.confirmText,
         cancelText = field.cancelText,
+        selectAllText = field.selectAllText,
         selectedColor = field.selectedColor,
         initialChildSize = field.initialChildSize,
         minChildSize = field.minChildSize,
@@ -397,6 +413,7 @@ class __MultiSelectBottomSheetFieldViewState<V>
             items: widget.items,
             cancelText: widget.cancelText,
             confirmText: widget.confirmText,
+            selectAllText: widget.selectAllText,
             separateSelectedItems: widget.separateSelectedItems,
             initialValue: _selectedItems,
             onConfirm: (selected) {
@@ -408,6 +425,7 @@ class __MultiSelectBottomSheetFieldViewState<V>
             },
             onSelectionChanged: widget.onSelectionChanged,
             searchable: widget.searchable,
+            selectAll: widget.selectAll,
             title: widget.title,
             initialChildSize: widget.initialChildSize,
             minChildSize: widget.minChildSize,
diff --git a/lib/dialog/mult_select_dialog.dart b/lib/dialog/mult_select_dialog.dart
index 8d00c2b..349ae83 100644
--- a/lib/dialog/mult_select_dialog.dart
+++ b/lib/dialog/mult_select_dialog.dart
@@ -23,12 +23,18 @@ class MultiSelectDialog<T> extends StatefulWidget with MultiSelectActions<T> {
   /// Toggles search functionality. Default is false.
   final bool searchable;
 
+  /// Toggles select all functionality. Default is false.
+  final bool selectAll;
+
   /// Text on the confirm button.
   final Text? confirmText;
 
   /// Text on the cancel button.
   final Text? cancelText;
 
+  /// Text on the select all button, if enabled.
+  final Text? selectAllText;
+
   /// An enum that determines which type of list to render.
   final MultiSelectListType? listType;
 
@@ -86,8 +92,10 @@ class MultiSelectDialog<T> extends StatefulWidget with MultiSelectActions<T> {
     this.onConfirm,
     this.listType,
     this.searchable = false,
+    this.selectAll = false,
     this.confirmText,
     this.cancelText,
+    this.selectAllText,
     this.selectedColor,
     this.searchHint,
     this.height,
@@ -153,14 +161,8 @@ class _MultiSelectDialogState<T> extends State<MultiSelectDialog<T>> {
         controlAffinity: ListTileControlAffinity.leading,
         onChanged: (checked) {
           setState(() {
-            _selectedValues = widget.onItemCheckedChange(
-                _selectedValues, item.value, checked!);
+            _setSelectedState(item, checked!);
 
-            if (checked) {
-              item.selected = true;
-            } else {
-              item.selected = false;
-            }
             if (widget.separateSelectedItems) {
               _items = widget.separateSelected(_items);
             }
@@ -196,14 +198,8 @@ class _MultiSelectDialogState<T> extends State<MultiSelectDialog<T>> {
         ),
         selected: item.selected,
         onSelected: (checked) {
-          if (checked) {
-            item.selected = true;
-          } else {
-            item.selected = false;
-          }
           setState(() {
-            _selectedValues = widget.onItemCheckedChange(
-                _selectedValues, item.value, checked);
+            _setSelectedState(item, checked);
           });
           if (widget.onSelectionChanged != null) {
             widget.onSelectionChanged!(_selectedValues);
@@ -213,6 +209,24 @@ class _MultiSelectDialogState<T> extends State<MultiSelectDialog<T>> {
     );
   }
 
+  void _setSelectedState(MultiSelectItem item, bool checked) {
+    _selectedValues = widget.onItemCheckedChange(
+        _selectedValues, item.value, checked);
+
+    if (checked) {
+      item.selected = true;
+    } else {
+      item.selected = false;
+    }
+  }
+
+  void _selectAll(bool checked) {
+    _items.forEach((item) => _setSelectedState(item, checked));
+    if (widget.onSelectionChanged != null) {
+      widget.onSelectionChanged!(_selectedValues);
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return AlertDialog(
@@ -311,6 +325,21 @@ class _MultiSelectDialogState<T> extends State<MultiSelectDialog<T>> {
             widget.onCancelTap(context, widget.initialValue);
           },
         ),
+        if (widget.selectAll) TextButton(
+          child: widget.selectAllText ??
+              Text(
+                "SELECT ALL",
+                style: TextStyle(
+                  color: (widget.selectedColor != null &&
+                      widget.selectedColor != Colors.transparent)
+                      ? widget.selectedColor!.withOpacity(1)
+                      : Theme.of(context).primaryColor,
+                ),
+              ),
+          onPressed: () {
+            setState(()=>_selectAll(true));
+          },
+        ),
         TextButton(
           child: widget.confirmText ??
               Text(
diff --git a/lib/dialog/multi_select_dialog_field.dart b/lib/dialog/multi_select_dialog_field.dart
index ed72e6c..fc38e9d 100644
--- a/lib/dialog/multi_select_dialog_field.dart
+++ b/lib/dialog/multi_select_dialog_field.dart
@@ -42,12 +42,18 @@ class MultiSelectDialogField<V> extends FormField<List<V>> {
   /// Toggles search functionality.
   final bool searchable;
 
+  /// Toggles select all functionality. Default is false.
+  final bool selectAll;
+
   /// Text on the confirm button.
   final Text? confirmText;
 
   /// Text on the cancel button.
   final Text? cancelText;
 
+  /// Text on the select all button, if enabled.
+  final Text? selectAllText;
+
   /// Set the color of the space outside the BottomSheet.
   final Color? barrierColor;
 
@@ -114,8 +120,10 @@ class MultiSelectDialogField<V> extends FormField<List<V>> {
     this.onSelectionChanged,
     this.chipDisplay,
     this.searchable = false,
+    this.selectAll = false,
     this.confirmText,
     this.cancelText,
+    this.selectAllText,
     this.barrierColor,
     this.selectedColor,
     this.searchHint,
@@ -157,8 +165,10 @@ class MultiSelectDialogField<V> extends FormField<List<V>> {
                 onSelectionChanged: onSelectionChanged,
                 initialValue: initialValue,
                 searchable: searchable,
+                selectAll: selectAll,
                 confirmText: confirmText,
                 cancelText: cancelText,
+                selectAllText: selectAllText,
                 barrierColor: barrierColor,
                 selectedColor: selectedColor,
                 searchHint: searchHint,
@@ -193,8 +203,10 @@ class _MultiSelectDialogFieldView<V> extends StatefulWidget {
   final List<V>? initialValue;
   final void Function(List<V>)? onConfirm;
   final bool? searchable;
+  final bool? selectAll;
   final Text? confirmText;
   final Text? cancelText;
+  final Text? selectAllText;
   final Color? barrierColor;
   final Color? selectedColor;
   final double? dialogHeight;
@@ -225,8 +237,10 @@ class _MultiSelectDialogFieldView<V> extends StatefulWidget {
     this.chipDisplay,
     this.initialValue,
     this.searchable,
+    this.selectAll,
     this.confirmText,
     this.cancelText,
+    this.selectAllText,
     this.barrierColor,
     this.selectedColor,
     this.searchHint,
@@ -259,8 +273,10 @@ class _MultiSelectDialogFieldView<V> extends StatefulWidget {
         chipDisplay = field.chipDisplay,
         initialValue = field.initialValue,
         searchable = field.searchable,
+        selectAll = field.selectAll,
         confirmText = field.confirmText,
         cancelText = field.cancelText,
+        selectAllText = field.selectAllText,
         barrierColor = field.barrierColor,
         selectedColor = field.selectedColor,
         dialogHeight = field.dialogHeight,
@@ -380,8 +396,10 @@ class __MultiSelectDialogFieldViewState<V>
           title: widget.title ?? const Text("Select"),
           initialValue: _selectedItems,
           searchable: widget.searchable ?? false,
+          selectAll: widget.selectAll ?? false,
           confirmText: widget.confirmText,
           cancelText: widget.cancelText,
+          selectAllText: widget.selectAllText,
           separateSelectedItems: widget.separateSelectedItems,
           onConfirm: (selected) {
             if (widget.state != null) {