James Michael Calvert DSO and Bar (6 March 1913 – 26 November 1998) was a British soldier involved in special operations in Burma during World War II. He participated in both Chindit operations and was instrumental in popularizing the unorthodox ideas of General Orde Wingate. Calvert frequently led risky attacks from the front, a practice that earned him the nickname "Mad Mike." He was court-martialled for an alleged act of indecency and dismissed from the Army in 1952.