Shajahan Siraj (1 March 1943 – 14 July 2020) was a Bangladeshi politician who served as the vice chairman of the Bangladesh Nationalist Party (BNP). As a student, he was involved with the Bangladesh Liberation War. He was one of the founders of Jatiya Samajtantrik Dal. He was a member of Jatiya Sangsad representing the Tangail-4 constituency.