| Socialist Left | |
| Native Name: | Izquierda Socialista |
| Colorcode: | Red |
| Foundation: | 1989 |
| Ideology: | Socialism |
| Country: | Peru |
| Abbreviation: | IS |
| Dissolved: | 1990s? |
| Predecessor: | ASI |
| Position: | Left-wing |
Socialist Left (Spanish; Castilian: Izquierda Socialista or IS) was an electoral alliance in Peru formed by Left Socialist Accord (ASI) and the non-party socialist movement in 1989. In the 1990 presidential elections, IS launched 1985 presidential candidate Alfonso Barrantes Lingán as its candidate but lost.