The 99th Deccan Infantry were an infantry regiment of the British Indian Army. They could trace their origins to 1788, when they were raised as the 1st Battalion of the Ellichpur Brigade for the Princely state of Hyderabad. Until 1853, the regiment was part of the Nizam of Hydrabad's Army then after signing of a treaty with the then Governor General of India, The Nizam's Contingent was renamed as the Hyderabad Contingent and became part of the regular Indian Army.