Socialist Alternative can refer to any of several Trotskyist political organizations, many affiliated to the Committee for a Workers International or Reunified Fourth International:
| Country | Organization | International affiliation |
|---|---|---|
| Australia | Socialist Alternative | 1995 split from the International Socialist Tendency but shares its basic politics |
| Austria | Socialist Alternative | Reunified Fourth International |
| Canada | Socialist Alternative | Committee for a Workers International |
| Germany | Socialist Alternative | Committee for a Workers International |
| Netherlands | Socialist Alternative | Committee for a Workers International |
| New Zealand | Socialist Alternative | Committee for a Workers International |
| Portugal | Socialist Alternative | Committee for a Workers International |
| Switzerland | Socialist Alternative / Solidarity | Reunified Fourth International |
| Trinidad and Tobago | Socialist Alternative | No known formal affiliation |
| United Kingdom | Socialist Alternative (name used by the Socialist Party to contest elections) | Committee for a Workers International |
| United States | Socialist Alternative | Committee for a Workers International |
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