Commodore (Cdre) is a rank of the Royal Navy above captain and below rear admiral. It has a NATO ranking code of OF-6. The rank is equivalent to brigadier in the British Army and Royal Marines and to air commodore in the Royal Air Force.
A modern commodore's rank insignia consists of a 45-millimetre-wide band of gold lace, with a circle of 13-millimetre-wide lace 45 millimetres in diameter above.
Modern commodores wear the insignia previously worn by commodores second class. Commodore has only been a substantive rank in the Royal Navy since 1997. Before then it continued to be an appointment conferred on senior captains holding certain positions. For example, the senior commander of destroyers within a fleet in the Royal Navy could carry the title of "Commodore (D)", while the a fleet's senior commander of submarines could carry the title of "Commodore (S)", although in both cases as an appointment rather than a rank.