Abstract: A boat umbrella including a boat with a post upwardly extending therefrom. A base is provided having a rod including a pair of resilient sleeves mounted to the rod of the base via clamps in concentric relationship with respect to each other such that an axis about which the sleeves are situated resides in parallel with that of the rod. The sleeves include a first sleeve mounted at a lower end of the rod of the base and a second sleeve mounted at a central extent of the rod of the base. The rod of the base also has a threaded bore formed therein adjacent to an upper end thereof for receiving a set screw. The sleeves are designed to releasably receive the post of the boat such that the rod of the base is vertically oriented. An umbrella assembly including a member with a top end having a collapsible umbrella mounted thereon and a bottom end is removably situated within the upper end of the rod of the base and secured therein via the set screw.