The Garden Island Boat Ramp is a public three-lane concrete facility located on Garden Island in the North Arm of the Port River, approximately 14 kilometres north-west of Adelaide's CBD.

Situated beside the Angas Inlet Boat Club, it features pontoons on both sides to assist with launching and retrieval of both powered and unpowered watercraft.

The ramp can be busy, particularly with powered craft, and users should give way to powered vessels in the boating channel.

The ramp serves as a key access point into the Adelaide Dolphin Sanctuary, which covers 118 square kilometres including the Port River, North Arm, and surrounding tidal creeks.

It is also the start and end point for the Garden Island Ships' Graveyard Maritime Heritage Trail, a 6-kilometre paddling circuit, as well as routes into Swan Alley Creek through the mangroves of Barker Inlet.

Flatwater conditions generally prevail, though tidal currents should be checked before departure.