diff --git a/packages/blockly/core/shortcut_items.ts b/packages/blockly/core/shortcut_items.ts
index 625444a73e7..0c594d0f9c0 100644
--- a/packages/blockly/core/shortcut_items.ts
+++ b/packages/blockly/core/shortcut_items.ts
@@ -60,6 +60,7 @@ export enum names {
   PREVIOUS_STACK = 'previous_stack',
   INFORMATION = 'information',
   PERFORM_ACTION = 'perform_action',
+  DUPLICATE = 'duplicate',
   CLEANUP = 'cleanup',
 }
 
@@ -871,6 +872,34 @@ export function registerPerformAction() {
   ShortcutRegistry.registry.register(performActionShortcut);
 }
 
+/**
+ * Registers keyboard shortcut to duplicate a block or workspace comment.
+ */
+export function registerDuplicate() {
+  const duplicateShortcut: KeyboardShortcut = {
+    name: names.DUPLICATE,
+    preconditionFn: (workspace, scope) => {
+      const {focusedNode} = scope;
+      return (
+        !workspace.isDragging() &&
+        !workspace.isReadOnly() &&
+        (focusedNode instanceof BlockSvg ? focusedNode.isDuplicatable() : true)
+      );
+    },
+    callback: (workspace, _e, _shortcut, scope) => {
+      keyboardNavigationController.setIsActive(true);
+      const copyable = isICopyable(scope.focusedNode) && scope.focusedNode;
+      if (!copyable) return false;
+      const data = copyable.toCopyData();
+      if (!data) return false;
+      return !!clipboard.paste(data, workspace);
+    },
+    keyCodes: [KeyCodes.D],
+    allowCollision: true,
+  };
+  ShortcutRegistry.registry.register(duplicateShortcut);
+}
+
 /**
  * Registers keyboard shortcut to clean up the workspace.
  */
@@ -919,6 +948,7 @@ export function registerKeyboardNavigationShortcuts() {
   registerDisconnectBlock();
   registerStackNavigation();
   registerPerformAction();
+  registerDuplicate();
   registerCleanup();
 }
 
diff --git a/packages/blockly/tests/mocha/shortcut_items_test.js b/packages/blockly/tests/mocha/shortcut_items_test.js
index 29996977e98..8df3e662fd9 100644
--- a/packages/blockly/tests/mocha/shortcut_items_test.js
+++ b/packages/blockly/tests/mocha/shortcut_items_test.js
@@ -1232,6 +1232,64 @@ suite('Keyboard Shortcut Items', function () {
     });
   });
 
+  suite('Duplicate (D)', function () {
+    test('Can duplicate blocks', function () {
+      const block = this.workspace.newBlock('controls_if');
+      Blockly.getFocusManager().focusNode(block);
+      assert.equal(this.workspace.getTopBlocks().length, 1);
+      const event = createKeyDownEvent(Blockly.utils.KeyCodes.D);
+      this.workspace.getInjectionDiv().dispatchEvent(event);
+      const topBlocks = this.workspace.getTopBlocks(true);
+      assert.equal(topBlocks.length, 2);
+      assert.notEqual(topBlocks[1], block);
+      assert.equal(topBlocks[1].type, block.type);
+    });
+
+    test('Can duplicate workspace comments', function () {
+      const comment = this.workspace.newComment();
+      comment.setText('Hello');
+      Blockly.getFocusManager().focusNode(comment);
+      assert.equal(this.workspace.getTopComments().length, 1);
+      const event = createKeyDownEvent(Blockly.utils.KeyCodes.D);
+      this.workspace.getInjectionDiv().dispatchEvent(event);
+      const topComments = this.workspace.getTopComments(true);
+      assert.equal(topComments.length, 2);
+      assert.notEqual(topComments[1], comment);
+      assert.equal(topComments[1].getText(), comment.getText());
+    });
+
+    test('Does not duplicate blocks on a readonly workspace', function () {
+      const block = this.workspace.newBlock('controls_if');
+      this.workspace.setIsReadOnly(true);
+      Blockly.getFocusManager().focusNode(block);
+      assert.equal(this.workspace.getTopBlocks().length, 1);
+      const event = createKeyDownEvent(Blockly.utils.KeyCodes.D);
+      this.workspace.getInjectionDiv().dispatchEvent(event);
+      assert.equal(this.workspace.getTopBlocks().length, 1);
+    });
+
+    test('Does not duplicate blocks that are not duplicatable', function () {
+      const block = this.workspace.newBlock('controls_if');
+      this.workspace.options.maxBlocks = 1;
+      assert.isFalse(block.isDuplicatable());
+      assert.equal(this.workspace.getTopBlocks().length, 1);
+      const event = createKeyDownEvent(Blockly.utils.KeyCodes.D);
+      this.workspace.getInjectionDiv().dispatchEvent(event);
+      assert.equal(this.workspace.getTopBlocks().length, 1);
+    });
+
+    test('Does not duplicate workspace comments on a readonly workspace', function () {
+      const comment = this.workspace.newComment();
+      comment.setText('Hello');
+      this.workspace.setIsReadOnly(true);
+      Blockly.getFocusManager().focusNode(comment);
+      assert.equal(this.workspace.getTopComments().length, 1);
+      const event = createKeyDownEvent(Blockly.utils.KeyCodes.D);
+      this.workspace.getInjectionDiv().dispatchEvent(event);
+      assert.equal(this.workspace.getTopComments().length, 1);
+    });
+  });
+
   suite('Clean up workspace (C)', function () {
     test('Arranges all blocks in a vertical column', function () {
       this.workspace.newBlock('controls_if');