Sir Thomas Hislop, 1st Baronet, GCB (5 July 1764 – 3 May 1843) was a senior British Army officer of the late eighteenth and early nineteenth centuries.

Although his ability as a general was praised, Hislop came under criticism in Parliament for his heavy reprisals against forces of the Maratha Empire, particularly at Talnar, where he ordered the execution of over 300 men.

Despite these problems, Hislop was later made a baronet and a Knight Grand Cross of the Order of the Bath, serving in his retirement as an equerry to Prince Adolphus, Duke of Cambridge.

Like his two elder brothers, Hislop followed his father into the British Army, studying at the Royal Military Academy, Woolwich before joining the 39th Regiment of Foot as an ensign in 1778.

[1] In 1795 Hislop undertook a secret diplomatic mission to Germany at the request of the Prince of Wales and was subsequently promoted to lieutenant colonel in the 115th Regiment of Foot, returning to the 39th six months later.

In 1806 as Spain was then at war with Britain, Hyslop agreed with admiral Alexander Cochrane to provide some support to general Francisco de Miranda for a second attempt to invade Venezuela under Spanish rule.

Advancing on 10 November, Hislop defeated the 35,000 strong army of Malhar Rao Holkar at the Battle of Mahidpur on 21 December and then ensured the surrender of the Maratha border fortresses.

[1] Hislop's actions at Talnar came under investigation at the urging of the Governor-General of India, Lord Moira, and as a result he was specifically excluded from the vote of thanks proposed in the House of Commons.