| William Seymour | |
| Birth Date: | 8 February 1664 |
| Death Date: | 9 or |
| Allegiance: | Great Britain |
| Branch: | British Army |
| Rank: | Lieutenant-General |
| Relations: | Sir Edward Seymour, 4th Baronet (father) |
Lieutenant-General William Seymour (8 February 1664 – 9 or 10 February 1728) was a British soldier and politician. He was the second son of Sir Edward Seymour, 4th Baronet, the prominent Tory. He served successively as Member of Parliament for Cockermouth, Totnes and Newport, Isle of Wight.[1]
On 3 October 1694, he took command as Colonel of the former Lord Cutts' Regiment of Foot. It was converted to a Marine regiment on 31 July 1698; he remained in command until it was disbanded on 20 May 1699. From 1 March 1701 until 12 February 1702 he was Colonel of the former Sir Edward Dering's Regiment of Foot, and was then appointed Colonel of The Queen's Regiment of Foot. He commanded it until 25 December 1717; it was a Marine regiment from 1703 until 1710. On 1 June 1702, he was appointed Brigadier-General of the Marine Regiments, which had that year been reformed for the War of the Spanish Succession.