David Ainsworth (1842 – 21 March 1906) was a British Liberal Party politician.
In 1885 and 1886 he ran for the Egremont constituency in Parliament, but lost.
His father, Thomas Ainsworth (1804-81), bought the Cleator Mills in Cleator and the nearby house called The Flosh from Henry Birley in about 1837 which was later passed to David.
In 1898, Ainsworth purchased Wray Castle, Hawkshead and this became his main seat for the last decade of his life.
This article about a Liberal Member of the Parliament of the United Kingdom representing an English constituency is a stub.