John Forster (1817–1878) was a British Whig politician.
Forster was elected Whig MP for Berwick-upon-Tweed at a by-election in 1853, which was held after both his father, Matthew Forster, and the Radical MP John Stapleton were unseated due to bribery and treating during the 1852 general election.
Forster held the seat until 1857, when he did not seek re-election.