David Barclay (29 September 1784, Eastwick – 1 July 1861) was an English Whig politician who sat in the House of Commons variously between 1826 and 1847. His father was and his mother Rachel Gurney. His father was a quaker and in 1780 became a partner in Thrale's brewery in Southwark. He worked at Barclay Brothers and Company, based at 34 Old Broad Street, and was auditor to a number of concerns: the African Institution, Rock Life Assurance Office.