Sir Henry Seymour, 1st Baronet

Sir Henry Seymour, 1st Baronet (20 October 1674 – April 1714), of Langley, Buckinghamshire, was an English landowner and Tory politician who sat in the English and British House of Commons from 1699 to 1713.

Seymour was the second son of Henry Seymour, of Langley, Buckinghamshire Groom of the Bedchamber, and his second wife Ursula Austen, daughter of Sir Robert Austen, 1st Baronet, and widow of George Stawale. He was the paternal grandson of Sir Edward Seymour, 2nd Baronet, and wife Dorothy Killegrew. He was created 1st Baronet Seymour, of Langley, at the age of seven on 4 July 1681. His father died on 9 March 1687, and he inherited Langley Park and his father's reversionary grant of the clerkship of the hanaper office. From 1693 he travelled abroad for three years.

Seymour died unmarried and without issue in London in April 1714. Langley Park, Buckinghamshire was sold in 1714 to Samuel Masham, 1st Baron Masham.