| Ecuadorian Socialist Party | |
| Native Name: | Partido Socialista Ecuatoriano |
| Abbreviation: | PSE |
| President: | Enrique Ayala Mora[1] |
| General Secretary: | Marcela Arellano Villa[2] |
| Foundation: | 1926 |
| Ideology: | Socialism |
| Headquarters: | Quito |
| International: | COPPPAL[3] São Paulo Forum[4] |
| Country: | Ecuador |
| Youth Wing: | Juventud Socialista Ecuatoriana |
| Womens Wing: | Frente de Mujeres Socialistas |
| Position: | Left-wing |
| National: | (2020-2021) United Front (2014-2018) |
| Seats1: | Including alliances |
| Seats1 Title: | Seats in the National Assembly |
| Membership: | 175.039(2016)[5] |
The Ecuadorian Socialist Party (Spanish; Castilian: Partido Socialista Ecuatoriano) is a leftist political party in Ecuador. It was born in 1926, and it was refounded in 1995 after the fusion between the Ecuadorian Socialist Party (Founded in 1926[6]) and the Leftist Broad Front, which was the electoral wing of the Communist Party of Ecuador. Currently, it is the oldest continuously existent party in Ecuador.