William Wilmer (c. 1692–1744), of Sywell Hall, Northamptonshire, was a British landowner and Whig politician who sat in the House of Commons between 1715 and 1744.
In 1706 he succeeded his father to Sywell Hall, where family had been seated since the beginning of the seventeenth century.
[3] Wilmer was returned as Whig Member of Parliament for Northampton at a by-election on 7 June 1715 by Lord Halifax who had vacated the seat on succeeding to a peerage.
He was caught up in a system of electoral deals and compromises between the parties, and was returned in a contest at the 1722 British general election, in spite of efforts to get Lord Halifax to place him elsewhere.
He and his wife had a daughter and three sons,[3] of whom Bennet, inherited the estate but died in the same year, leaving it to his aunt Dinah Wilmer.