| Country: | Greece |
| Socialist Initiative | |
| Colorcode: | orange |
| Foundation: | 1976 |
| Dissolved: | 1977 |
| Split: | Centre Union – New Forces |
| Ideology: | Social democracy Democratic socialism |
| Position: | Center-left |
| Flag: | Κόμμα Σοσιαλιστικής Πρωτοβουλίας.svg |
Socialist Initiative (Greek, Modern (1453-);: Σοσιαλιστική Πρωτοβουλία, Sosialistiki Protovoulia) was a Greek short-lived political party founded in 1976 by former members of Centre Union – New Forces, such as and Dimitris Tsatsos. In 1977, it participated in Progress and Left Forces Alliance, a coalition of small left-wing parties, and dissolved a few months later. Most of its members joined PASOK.