William Plumer (c.1686-1767) was a British lawyer and Whig, who sat in the House of Commons intermittently between 1721 and 1761.
Plumer was returned as Member of Parliament for Yarmouth (Isle of Wight) at a by-election on 10 February 1721.
He was brought in on the Treasury interest to replace Sir Theodore Janssen, who had been expelled over the South Sea Bubble and did not stand in 1722.
[2] Plumer was out of Parliament for over ten years, but was politically active in supporting Charles Caesar at elections at Hertfordshire.
[2] At the 1734 Plumer was selected as a candidate for Hertfordshire at a meeting of county electors and was elected MP, defeating Caesar.