Socialist Alternative (SA) is a Trotskyist organisation in Australia. As a revolutionary socialist group, it describes itself as aiming to organise collective struggles against oppression and inequality, while promoting the need for a revolutionary movement that could one day overthrow capitalism. Its members have been involved in organising numerous protest campaigns around issues such as LGBT rights, climate change, racism and refugee rights. The organisation also intervenes into the trade union and student union movements. It has branches and student clubs in most major Australian cities, and publishes the fortnightly newspaper Red Flag.