What U.S. Navy rank corresponds to O-6?

The rank that corresponds to O-6 in the U.S. Navy is Captain. In the Navy, the officer ranks are classified by a series of pay grades, with O-6 being defined as Captain. Captains typically hold significant leadership roles, often commanding large naval vessels or major shore installations, and their responsibilities reflect a high level of experience and expertise in naval operations.

The term "Captain" in this context does not refer to a ship's captain, which can also include other ranks below O-6. Instead, it designates the formal rank within the Navy's commissioned officer structure. Understanding this distinction is critical for grasping how ranks are organized within the Navy and the responsibilities associated with each level.