Julio Mariner (24 January 1975–26 May 2004) was a British Thoroughbred racehorse and sire best known for winning the classic St Leger Stakes in 1978. In a racing career which lasted from August 1977 until October 1978 he won three of his twelve starts. As a two-year-old he won only one of his five races but established himself as a top-class performer when he finished a close and unlucky second in the William Hill Futurity.
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