William Plumer may refer to:
William Plumer (died 1767) (c. 1686-1767), British Member of Parliament for Hertfordshire and Yarmouth (Isle of Wight) William Plumer (1736–1822), British Member of Parliament for Hertfordshire, Lewes and Higham Ferrers William Plumer (1759–1850), U.S. politician from New Hampshire William Plumer Jr. (1789-1854) was a U.S. Representative from New Hampshire, son of William Plumer William Swan Plumer (1802-1880), American clergyman
See also Bill Plummer, baseball player William Plummer (disambiguation)