A boat docket bumper assembly designed to be clamped to a boat dock to protect a boat from coming in direct contact with the dock. The boat dock bumper assembly includes a vertical support to one side of which a bumper can be attached. The assembly has a mounting member that when combined with suitable clamps, provides for attachment of the assembly to the edge of a dock regardless of its height. The vertical support may include a plurality of holes which provide for adjustability of the height of the bumper or it may include slots with adjustable tie bars to which the bumper can be attached.