Abstract: An adjustable boat whip assembly for maintaining a boat in spaced relation to a dock includes a boat whip, an elongate base member secured to the dock, a whip support member having a receptacle for receiving the boat whip in a generally upright position, and an interconnecting structure for attaching the support member to the base member so that the support member can move along the length of the base member. A fastener is further provided for locking the support member to the base member. In one embodiment of the invention, the base member of the boat whip assembly includes a structural tubular body having an upwardly extending top flange that is received in a slot provided in the support member. The arrangement is such that the support member is movable along the length of the base member.