diff --git a/arduino-ide-extension/src/browser/contributions/board-selection.ts b/arduino-ide-extension/src/browser/contributions/board-selection.ts
index 73d60d977..c90835c5c 100644
--- a/arduino-ide-extension/src/browser/contributions/board-selection.ts
+++ b/arduino-ide-extension/src/browser/contributions/board-selection.ts
@@ -3,12 +3,14 @@ import {
   DisposableCollection,
 } from '@theia/core/lib/common/disposable';
 import { MenuModelRegistry } from '@theia/core/lib/common/menu/menu-model-registry';
+import type { MenuPath } from '@theia/core/lib/common/menu/menu-types';
 import { nls } from '@theia/core/lib/common/nls';
 import { Deferred } from '@theia/core/lib/common/promise-util';
 import { inject, injectable } from '@theia/core/shared/inversify';
 import { MainMenuManager } from '../../common/main-menu-manager';
 import {
   BoardsService,
+  BoardWithPackage,
   createPlatformIdentifier,
   getBoardInfo,
   InstalledBoardWithPackage,
@@ -176,54 +178,104 @@ SN: ${SN}
       ? createPlatformIdentifier(selectedBoard)
       : undefined;
 
-    // Installed boards
-    installedBoards.forEach((board, index) => {
-      const { packageId, packageName, fqbn, name, manuallyInstalled } = board;
-
-      let packageLabel =
-        packageName +
-        `${
-          manuallyInstalled
-            ? nls.localize('arduino/board/inSketchbook', ' (in Sketchbook)')
-            : ''
-        }`;
-      if (
-        selectedBoardPlatformId &&
-        platformIdentifierEquals(packageId, selectedBoardPlatformId)
-      ) {
-        packageLabel = `✓ ${packageLabel}`;
+    // Keys are the vendor IDs
+    type BoardsPerVendor = Record<string, BoardWithPackage[]>;
+    // Group boards by their platform names. The keys are the platform names as menu labels.
+    // If there is a platform name (menu label) collision, refine the menu label with the vendor ID.
+    const groupedBoards = new Map<string, BoardsPerVendor>();
+    for (const board of installedBoards) {
+      const { packageId, packageName } = board;
+      const { vendorId } = packageId;
+      let boardsPerPackageName = groupedBoards.get(packageName);
+      if (!boardsPerPackageName) {
+        boardsPerPackageName = {} as BoardsPerVendor;
+        groupedBoards.set(packageName, boardsPerPackageName);
       }
-      // Platform submenu
-      const platformMenuPath = [
-        ...boardsPackagesGroup,
-        serializePlatformIdentifier(packageId),
-      ];
-      // Note: Registering the same submenu twice is a noop. No need to group the boards per platform.
-      this.menuModelRegistry.registerSubmenu(platformMenuPath, packageLabel, {
-        order: packageName.toLowerCase(),
-      });
+      let boardPerVendor: BoardWithPackage[] | undefined =
+        boardsPerPackageName[vendorId];
+      if (!boardPerVendor) {
+        boardPerVendor = [];
+        boardsPerPackageName[vendorId] = boardPerVendor;
+      }
+      boardPerVendor.push(board);
+    }
 
-      const id = `arduino-select-board--${fqbn}`;
-      const command = { id };
-      const handler = {
-        execute: () =>
-          this.boardsServiceProvider.updateBoard({ name: name, fqbn: fqbn }),
-        isToggled: () => fqbn === selectedBoard?.fqbn,
-      };
+    // Installed boards
+    Array.from(groupedBoards.entries()).forEach(
+      ([packageName, boardsPerPackage]) => {
+        const useVendorSuffix = Object.keys(boardsPerPackage).length > 1;
+        Object.entries(boardsPerPackage).forEach(([vendorId, boards]) => {
+          let platformMenuPath: MenuPath | undefined = undefined;
+          boards.forEach((board, index) => {
+            const { packageId, fqbn, name, manuallyInstalled } = board;
+            // create the platform submenu once.
+            // creating and registering the same submenu twice in Theia is a noop, though.
+            if (!platformMenuPath) {
+              let packageLabel =
+                packageName +
+                `${
+                  manuallyInstalled
+                    ? nls.localize(
+                        'arduino/board/inSketchbook',
+                        ' (in Sketchbook)'
+                      )
+                    : ''
+                }`;
+              if (
+                selectedBoardPlatformId &&
+                platformIdentifierEquals(packageId, selectedBoardPlatformId)
+              ) {
+                packageLabel = `✓ ${packageLabel}`;
+              }
+              if (useVendorSuffix) {
+                packageLabel += ` (${vendorId})`;
+              }
+              // Platform submenu
+              platformMenuPath = [
+                ...boardsPackagesGroup,
+                serializePlatformIdentifier(packageId),
+              ];
+              this.menuModelRegistry.registerSubmenu(
+                platformMenuPath,
+                packageLabel,
+                {
+                  order: packageName.toLowerCase(),
+                }
+              );
+            }
 
-      // Board menu
-      const menuAction = {
-        commandId: id,
-        label: name,
-        order: String(index).padStart(4), // pads with leading zeros for alphanumeric sort where order is 1, 2, 11, and NOT 1, 11, 2
-      };
-      this.commandRegistry.registerCommand(command, handler);
-      this.toDisposeBeforeMenuRebuild.push(
-        Disposable.create(() => this.commandRegistry.unregisterCommand(command))
-      );
-      this.menuModelRegistry.registerMenuAction(platformMenuPath, menuAction);
-      // Note: we do not dispose the menu actions individually. Calling `unregisterSubmenu` on the parent will wipe the children menu nodes recursively.
-    });
+            const id = `arduino-select-board--${fqbn}`;
+            const command = { id };
+            const handler = {
+              execute: () =>
+                this.boardsServiceProvider.updateBoard({
+                  name: name,
+                  fqbn: fqbn,
+                }),
+              isToggled: () => fqbn === selectedBoard?.fqbn,
+            };
+
+            // Board menu
+            const menuAction = {
+              commandId: id,
+              label: name,
+              order: String(index).padStart(4), // pads with leading zeros for alphanumeric sort where order is 1, 2, 11, and NOT 1, 11, 2
+            };
+            this.commandRegistry.registerCommand(command, handler);
+            this.toDisposeBeforeMenuRebuild.push(
+              Disposable.create(() =>
+                this.commandRegistry.unregisterCommand(command)
+              )
+            );
+            this.menuModelRegistry.registerMenuAction(
+              platformMenuPath,
+              menuAction
+            );
+            // Note: we do not dispose the menu actions individually. Calling `unregisterSubmenu` on the parent will wipe the children menu nodes recursively.
+          });
+        });
+      }
+    );
 
     // Detected ports
     const registerPorts = (