Radical left may refer to:
Political thought
- Radical left-wing politics or far-left politics
- The left part of radicalism, a political movement which shifted towards the centre during the 20th-century
Political parties and movements
- In Cyprus
- Committee for a Radical Left Rally (ERAS), a left-wing political party/organization
- In Denmark
- The Danish Social Liberal Party (Danish: Radikale Venstre, literally "Radical Left", est. 1905), a social-liberal party
- In France
- Radical Left (France), a liberal parliamentary group during the French Third Republic
- Radical Party of the Left (Parti radical de gauche, PRG, est. 1972), a social-liberal party
- Les Radicaux de gauche (litt. the "Left Radicals", LRDG), split of the PRG around MEP Virginie Rozière, est. 2017
- In Greece
- Syriza or Coalition of the Radical Left (est. 2004), a left-wing political party
- Radical Left Front (Μέτωπο Ριζοσπαστικής Αριστεράς, Metopo Rizospastikis Aristeras, MERA, 1999–2009), a former alliance of left-wing political parties