A telescoping boat tower apparatus attachable atop a deck structure of a boat. The apparatus includes lower and upper frame assemblies each including spaced upright tubular supports, the lower frame assembly supports attachable at a lower end thereof to the deck. The tubular supports of the upper assembly are connected at an upper end to a standing platform positioned above a console of the boat. The upper frame assembly includes spaced upright elongated second tubular supports, which are connected at an upper end thereof to a body support rail and held in telescoping coaxial alignment and registry with corresponding first tubular members whereby the upper frame assembly is slidably movable vertically with respect to the lower frame assembly. An elongated sealed interior chamber defined between at least one pair of corresponding first and second tubular supports is connected to a source of pressurized fluid introducible into the chamber whereby the upper frame assembly is vertically movable with respect to the lower frame assembly.