Abstract: A boat trailer step assembly is provided with several features making the assembly adjustable in several respects, allowing the step to be placed at varying positions for different trailers and boats. The step is mounted on a support member made of overlapping parts that can be extended or contracted to obtain different heights. The support member is connected to a rotatable plate at a 45 degree angle. This allows the step to be extended outward in various directions. Adjustment of the step location in a generally front-to-rear direction is provided by sliding a clamping device along a beam of the trailer on which it is mounted.