William Sinclair (4 September 1804 – 8 July 1878) was a Scottish author and rector of St George's Church, Leeds, and of Pulborough, Sussex.
He was educated at Winchester College but left at the age of sixteen, obtained a commission in the Madras cavalry, and distinguished himself by leading a forlorn hope at the siege of Kittoor in 1824.
[1] At Oxford he became president of the Union when it numbered among its members Archibald Tait, Roundell Palmer, Edward Cardwell, and Robert Low.
[3] In 1837 Sinclair took holy orders and accepted the parish of St George's, Leeds, where, as a liberal evangelical, he laboured for twenty years with such ardour as seriously to undermine his constitution.
In 1837 Sinclair married Helen, daughter of William Ellice (who had been MP for Great Grimsby).