Major-General Anthony St Leger (c.29 February 1731 – 19 April 1786) was a British Army officer, Member of Parliament for Great Grimsby, and the founder of the St. Leger Stakes horse race.
Baptised in February 1731 at Grangemellon, Kildare, Ireland, he was the fourth son of Sir John St Leger, who was a judge of the Court of Exchequer, and his second wife Lavinia, daughter of Kingsmill Pennefather of Cashel.
That same year he was appointed lieutenant-colonel of the 124th Regiment of Foot, but a year later the regiment disbanded, and St Leger took on the Park Hill estate in Firbeck, where he later bred and raced horses.
In 1779, St Leger re-entered the army as colonel of the 86th Regiment of Foot.
He subsequently achieved the rank of brigadier general, before serving a period as the Governor of Saint Lucia (1781-1783).