The Eastern Command is one of the six operational commands of the Indian Army. It is headquartered in Fort William in the city of Kolkata in the state of West Bengal. The Eastern Command was formed on 1 November 1920. The Command is commanded by a three-star rank officer with the title General Officer Commanding-in-Chief (GOC-in-C).

Fort William is a fort in Hastings, Calcutta (Kolkata). It was built during the early years of Britain's administration of Bengal. It sits on the eastern banks of the River Hooghly, the major distributary of the River Ganga. One of Kolkata's most enduring British-era military fortifications, other than those in Bombay (Mumbai) and Madras (Chennai), it extends over an area of seventy hectares.