Socialist Left (Izquierda Socialista) is a Trotskyist political group in Argentina.
It is the Argentine section of International Workers' Unity – Fourth International.
It is one of three groups participating in the Workers' Left Front.
Members include Liliana Olivero, a former deputy in the provincial legislature in Córdoba Province, Argentina, and Angélica Lagunas, a provincial deputy in Neuquén Province.