Abstract: A convertible top for a motorcycle sidecar has a rigid collapsible frame which folds onto the rear of the sidecar when not in use. The frame has a pair of spaced clamps for securing the frame in an erected condition to the windshield of the sidecar. A foldable fabric top is disposed over the collapsible supporting frame and is attachable to the sides and windshield of the sidecar by snaps. The fabric top may be provided with portholes and windows, which may be secured in a closed position by hook and loop fasteners.