South Stradbroke Island is an Australian island in the state of Queensland, south of Brisbane and just north of the Gold Coast. The 22 km by 2.5 km sized island is the smaller one of the two Stradbroke Islands and lies very close to the mainland.

In the north the island is separated by the Jumpinpin Channel from the larger North Stradbroke Island. Before 1896 the island was part of the Stradbroke Island. In that year the island was separated by a storm from North Stradbroke Island.

In the northeast you find the Tipplers Passage that separates the island from many small islands near the mainland and in the southeast the island is separated by The Broadwater from the mainland near Southport. The eastcoast borders the Coral Sea.

The island lives on tourism, but nothing compared to Australia's largest tourist resort, the nearby Gold Coast. The island has some quiet campsides. The western beaches are known as quiet and lagoon-like and the eastern beaches are known as a surfer paradise.

South Stradbroke Island consist mainly of sand, sand dunes and subtropical forest. The island also has a specific flora and fauna. The Golden Wallaby for example only lives on this island.