The Diocese of Fréjus–Toulon is a Latin diocese of the Catholic Church in southeastern France on the Mediterranean coast. The present diocese comprises the territory of the ancient Diocese of Fréjus as well as that of the ancient Diocese of Toulon. In 1957 it was renamed as the Diocese of Fréjus–Toulon.

The former French Catholic diocese of Grasse was founded in the 4th or 5th century as the diocese of Antibes. It was originally suffragan to the Archbishop of Aix, and then to the Archbishop of Embrun. The see moved from Antibes to Grasse in 1244. It remained at Grasse Cathedral until the French Revolution. The diocese was suppressed by the Concordat of 1801, its territory passing to the diocese of Nice.