The Siege of Ambur (10 November – 7 December 1767) was conducted by a combined force of Mysorean and Hyderabadi troops under the command of Hyder Ali against the town of Ambur in southern India during the First Anglo-Mysore War. The town was defended by a garrison of local troops and a small force of British East India Company troops under the command of Captain Calvert. The siege was lifted when company reinforcements arrived.