Major-General William Nairn Forbes was a British architect and military engineer in the Bengal Army. He was responsible for the design of the Anglican St Paul's Church, Calcutta (1839–47) in Bengal during Company rule in India, now the cathedral of the Diocese of Calcutta and sited in Kolkata, India.
- Occupation
- military officer, civil engineer
- Citizenship
- Kingdom of Great Britain, United Kingdom of Great Britain and Ireland
- Born
- April 3, 1796
- Died
- May 1, 1855