Paul Joseph Le Blanc (born 1947) is an American historian and activist. He is Professor of History and Political Science at La Roche College, and has written several books on labor history and revolutionary Marxism. A Trotskyist, Le Blanc was previously a member of Students for a Democratic Society, the Socialist Workers Party, Fourth Internationalist Tendency, and Solidarity. He joined the International Socialist Organization in 2009. Michael Yates described Le Blanc as "an 'organic intellectual,' a scholar and activist who has risen directly out of the working class."