Isidre Molas i Batllori (born 12 October 1940) is a Catalan politician and historian, who has served as the fifth President of the Socialists' Party of Catalonia since 19 July 2008.

In 1963, Molas graduated in law in the Autonomous University of Barcelona.

He was an active member of the Front Obrer de Catalunya (Workers' Front of Catalonia) and joined the left-wing anti-Franco movement Frente de Liberación Popular (Popular Liberation Front).

In 2000, Molas was elected Senator from Barcelona by the Catalan Agreement of Progress, a union of a left-wing catalanist parties.

Molas has translated books, and he published articles about political science.