Diddams Close Boat Ramp is a single-lane ramp located in Belconnen, ACT, providing access to Lake Ginninderra. From the lake, boaters can also travel along Ginninderra Creek toward Gungahlin.

It is one of two boat ramps on Lake Ginninderra, the other being at Western Foreshore Park.

The ramp is suitable for launching small boats and personal watercraft, though users have noted it lacks an ideal slope into the water and has rocky conditions at the water's edge, with no facility to tie up or dock vessels.

Ample parking is available nearby, and the surrounding area includes picnic tables, BBQ facilities, a playground, and open space suitable for walking dogs.