Mortimer Phillips Bainbridge (10 November 1808 – 15 July 1857) was an American politician.

Bainbridge was a lawyer born in Louisville, Kentucky, on 10 November 1808. He later moved to Iowa Territory, where, on 22 July 1839, he married Elizabeth Sarah Ann Graham Hooe at Fort Snelling. Bainbridge was elected to the Iowa Legislative Assembly as a Whig from Dubuque County between 1840 and 1842. He was president of the Iowa Council and held the District 10 seat. After the Whig Party dissolved, Bainbridge joined the Democratic Party. He died in King George County, Virginia on 15 July 1857.^[1]