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.

Hastings is a neighbourhood of Central Kolkata in Kolkata district in the Indian state of West Bengal.