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