The event was established in 1952, and it was originally called the Prix de la Côte Normande. The inaugural running was contested over 3,000 metres, and the race was shortened to 2,000 metres in its second year. It was extended to 2,400 metres in 1958, and restored to 2,000 metres in 1960. The present system of race grading was introduced in 1971, and for a period the Prix de la Côte Normande was classed at Group 3 level. It was promoted to Group 2 status in 1983. The race was renamed the Prix Guillaume d'Ornano in 1987. It was named in memory of
Guillaume d'Ornano, a former owner of Haras de Manneville, a stud farm near Deauville. ==Records==