Ambrosio (foaled 1793) was a British Thoroughbred racehorse and sire best known for winning the classic St Leger Stakes in 1796. In a racing career which lasted from May 1796 until September 1799 he won fifteen of his twenty-three races. As a three-year-old he was based in Yorkshire, where he won his first three races before justifying his position as odds-on favourite for the St Leger, beating six opponents. In the next two years he competed mainly at Newmarket, where his victories three divisions of the Oatlands Stakes and the Jockey Club Plate. He returned to Yorkshire as a six-year-old to win a division of the Great Subscription Purse at York before being retired to stud. Ambrosio stood as a breeding stallion in Great Britain and Ireland, but had little success as a sire of winners.