Alfred Seymour MP, JP (11 November 1824 – 15 March 1888), of Knoyle House, East Knoyle, Wiltshire, and of Trent, Dorset, was a British Liberal Party politician.

He was a son of Henry Seymour of Knoyle House, Wiltshire, of Trent and of Northbrook and wife Jane Hopkinson, and brother of Henry Danby Seymour of Trent.

He was elected as a Member of Parliament (MP) for Totnes at a by-election in January 1863, and held the seat until the borough was disenfranchised in 1868.^[1] He returned to the House of Commons the following year, when he was elected at a by-election for Salisbury, and held that seat until his defeat at the 1874 general election.^[2]

Seymour was also a Justice of the Peace. He succeeded in Knoyle House, Wiltshire, in 1863.

He married on 18 August 1866 Isabella Leighton (d. 7 April 1911), daughter of Sir Baldwyn Leighton, 8th Baronet, and wife, and widow of Beriah Botfield of Hopton Court, Shropshire, Member of Parliament, and had one daughter:

• Jane Margaret Seymour (14 March 1873 – 5 August 1943), unmarried and without issue

• Hansard 1803–2005: contributions in Parliament by Alfred Seymour