Socialist Alliance
- Albanian Socialist Alliance Party
- Alternative Socialist Alliance - Independents
- Anti-Capitalist Alliance
- London Socialist Alliance
- People's Front of Yugoslavia
- Samajwadi Alliance
- Scottish Socialist Alliance
- Socialist Alliance (Australia)
- Socialist Alliance (Burkina Faso)
- Socialist Alliance (Mexico)
- Socialist Alliance (Sri Lanka)
- Socialist Alliance Party
- Socialist Environmental Alliance
- Socialist Labour Alliance
- Socialist Popular Alliance Party
- Socialist Trade and Labor Alliance
- Socialist Youth Alliance
- Welsh Socialist Alliance
- Young Socialist Alliance