Rivoli Bay (French: Baie de Rivoli) is a bay located on the south-east coast of the Australian state of South Australia, about 311 kilometres (193 miles) south-southeast of the state capital of Adelaide and about 65 kilometres (40 miles) northwest by west of the regional centre of Mount Gambier.

It was named in 1802 by the Baudin expedition of 1800–03 after André Masséna, the Duke of Rivoli and Marshal of France.

Rivoli Bay lies between Glenns Point or Cape Martin[citation needed] at its northwestern extremity and Cape Buffon at its southeastern extremity, on the south-east coast of South Australia.

The central part of the bay is described as "obstructed by numerous reefs, rocky patches, and shoals and is dangerous for navigation" and as having "a sandy beach".

Australian sea lions were hunted in Rivoli Bay for their skins in the 1870s.