Col. Lord John Thomas Henry Somerset (30 August 1787 – 3 October 1846) was a British Army officer and aristocrat from the House of Beaufort.

In August 1804, just shy of his 17th birthday, Somerset joined the 7th Light Dragoons as a cornet without purchase.

[9] On 4 December 1814, while serving in Brussels as aide de camp to the Prince of Orange, Lord John married the Anglo-Irish aristocrat Lady Catherine Annesley, younger daughter of Arthur Annesley, 1st Earl of Mountnorris and Hon.

[10] Lord and Lady John Somerset attended the famed Duchess of Richmond's ball on 15 June 1815, the night before the Battle of Quatre Bras.

[9] After several months' illness, he died aged 59 at Weston-super-Mare, Somerset, where doctors had advised him to go for the sea air.