Major-General William Nairn Forbes (3 April 1796 – 1 May 1855) was a British architect and military engineer in the Bengal Army.[1][2] 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.[1]
Forbes's design for the spire and crossing tower of St Paul's, Calcutta was inspired by Norwich Cathedral, in Norfolk, England.[1] After damage in successive earthquakes in 1897 and 1934 the tower and spire were redesigned on the model of the "Bell Harry" Tower – designed by John Wastell – on the crossing of Canterbury Cathedral in Kent, the seat of the Archbishop of Canterbury and the mother church of the Anglican Communion.[1]
Forbes was also architect in 1831 of the Greek Revival Calcutta Silver Mint and drew inspiration for the portico from the Parthenon in Athens.[1]