James Rust (1798 – 24 July 1875) was a British Conservative politician. Rust was first elected Conservative MP for Huntingdonshire at a —caused by the succession of William Montagu to 7th Duke of Manchester. He was again elected at the 1857 general election, although the vote unusually resulted in a triple return with his fellow incumbent Conservative MP Edward Fellowes securing the same number of votes as the Whig cricketer John Heathcote. After scrutiny, Heathcote was declared unduly elected a few months later. Rust held the seat until the 1859 general election when he did not stand.