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.
Returning to England, Sinclair matriculated at St Mary's Hall, Oxford, in 1832, and graduated B.A.
[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.