Abstract: The present invention relates to a boat dry docking apparatus for installation in a boat dock having substantially parallel sides. An elongated frame is provided adapted to be disposed horizontally in the boat dock and a boat supporting cradle and flotation tank are mounted on the frame. A pair of spaced apart arm members are pivotally attached at the lower ends thereof to each side of the frame and bolts are connected to the upper ends of the arm members for pivotally connecting the upper ends to the sides of the boat dock.