John Collier (2 March 1769 – 28 February 1849) was a British politician.
He was brought up in the Society of Friends, but was ejected while in his youth, for disobeying the group's rules.
While young, he was said to be the first man in Plymouth to wear his hair short, which was generally thought to be a sign of sympathy for the French Revolution.
He strongly backed the Reform Act 1832, organising large meetings in its support, and as a consequence, at the 1832 UK general election, he was elected as a Whig for the constituency of Plymouth.
In Parliament, he supported shorter Parliamentary terms, secret ballots, and the abolition of monopolies.