The Chief of Staff, Mediterranean Fleet, also formally known as Chief of Staff to the Commander-in-Chief Mediterranean Fleet[1] and originally called Flag Captain, Mediterranean Fleet, was a senior British Royal Navy appointment.

The appointee was the commander-in-chief's primary aide-de-camp providing administrative support from October 1893 to 1967.

From May 1905 until July 1912, the office holder also held the additional title of Flag Captain, Mediterranean Fleet, or formally Flag Captain to the Commander-in-Chief, Mediterranean Fleet.

[3] As part of continuing cost cutting by the Ministry of Defence in 1967, the Mediterranean Fleet was abolished along with this office.

The final office holder was Commodore David B. N. Mellis.