David Seymour may refer to: David Seymour (photographer) (1911–1956), a photographer and photojournalist David L. Seymour (1803–1867), U.S. Representative from New York David Seymour (rugby union) (born 1984), English rugby union player David Thompson Seymour (1831–1916), Irish soldier and police commissioner David Seymour (English politician) (died 1557/58), 14th century Member of Parliament (MP) for Wareham and Great Bedwyn David Seymour (New Zealand politician) (born 1983), leader of the ACT Party