William Plumer (disambiguation)

• William Plumer (died 1767), British Member of Parliament for Hertfordshire and Yarmouth
• William Plumer (1736–1822), British Member of Parliament for Hertfordshire, Lewes and Higham Ferrers
• William Plumer, U.S. politician from New Hampshire
• William Plumer Jr. was a U.S. Representative from New Hampshire, son of William Plumer
• William Swan Plumer, American clergyman