Phoenix Park Racecourse is a former horse racing venue in Ireland. It was located in the townlands of Ashtown and Castleknock in the civil parish of Castleknock on the northern edge of the Phoenix Park in Dublin. The course was founded by J. H. H. Peard, and racing began there in 1902.
From 1939 to 1950 the track was managed by Mr Peard's son Harry, and thereafter it was run by his widow Fanny. Mrs Peard retired in 1969, and the track closed for the first time at the end of the 1981 season. The course re-opened for the 1983 season, now owned by a consortium which included Vincent O'Brien and Robert Sangster. Due to financial difficulties the track was permanently closed for racing in late 1990.