Which rank is associated with the O-4 pay grade?

The rank associated with the O-4 pay grade is Commander. In the United States Navy, the rank structure designates officers with specific pay grades, and O-4 is recognized as the rank of Commander. This rank comes with significant responsibilities, often involving command of a ship or a major organizational unit.

To provide context, Lieutenant and Lieutenant Junior Grade are ranks associated with the O-3 and O-2 pay grades, respectively, so they are not connected to the O-4 pay grade. Rear Admiral Lower Half is designated as O-7, which is a higher rank than Commander. Understanding these distinctions in rank and pay grade is essential for comprehending the naval hierarchy and the roles associated with each rank.