Gage Roads (also known as Success Bank) is the sea channel in the Indian Ocean offshore the city of Perth, Australia. It was the location of the America's Cup defense in 1986/7, and serves as a shipping lane and anchorage for most sea traffic heading towards the seaport of Fremantle.

Rottnest Island lies to the west and Cockburn Sound to the south.

The area is the most northern of one of four coastal basins formed from the flooding of a depression between Pleistocene aeolianite ridges running north-south, and the subsequent deposition of east-west Holocene banks. The seabed of Gage Roads is covered by seagrass.