Alexander Theodore Callinicos (born 24 July 1950) is a Zimbabwean-born British political theorist and activist. In an academic capacity, he serves as Professor of European Studies at King's College London. An adherent of Trotskyism, he is a member of the Central Committee of the Socialist Workers Party (SWP) and serves as its International Secretary. He is also editor of International Socialism, the SWP's theoretical journal, and has published a variety of books.