Commodore (Royal Navy) . Commodore ( Cdre ) is a rank of the Royal Navy above captain and below rear admiral . Commodore is a naval rank used in many navies that is superior to a navy captain , but below a rear admiral . It is often regarded as a one-star rank with a NATO code of OF-6 ( which is known in the U.S. as `` rear admiral ( lower half ) '' ) , but whether it is regarded as a flag rank varies between countries .
Commodore is ranked below a rear end.