An officer who ranks next above a captain; sometimes, by courtesy, the senior captain of a squadron. The rank of commodore corresponds with that of brigadier general in the army.
- A commissioned rank formerly used in the U.S. Navy that was above captain and below rear admiral. Abolished in 1899, it was restored temporarily during World War II.
- One who holds this rank.
- Used as an unofficial designation for a captain in the British Navy temporarily in command of a fleet division or squadron.
- The senior captain of a naval squadron or merchant fleet.
- The presiding officer of a yacht club.