Richard Plumer (c.1689–25 November 1750) was a British politician who sat in the House of Commons from 1722 to 1750.
Plumer was the third surviving son of John Plumer, a wealthy London merchant of Blakesware, Hertfordshire, and his wife Mary Hale, daughter of William Hale of King's Walden, Hertfordshire.
He was returned again as MP for Lichfield at the 1722 general election, but in that year was dismissed from his office at the Board of Trade to make way for someone else.
At the 1734 general election he was returned as MP for St Mawes on the recommendation of Walpole.
He was re-appointed as Lord of Trade in 1735 and from then on voted consistently with the Administration.