Commodore is a military rank used in many navies for officers whose position exceeds that of a navy captain, but is less than that of a rear admiral. In the Star Trek mythos, a Commodore is a flag officer level rank as denoted by the broad gold sleeve band. Their duties appear to be particular to a specific officer's career path rather than to rank. Some Commodores serve in the field as task group leaders or ship commanders. Others are base commanders or administrative officers. The title was eventually replaced with the rank of Rear-Admiral. Examples include: Commodore José I. Mendez.

In the original Star Trek series, another title used to describe a Commodore in the Federation Starfleet is Portmaster. A man named Stone held this title in the year 2267 when he presided over James T. Kirk's court martial in "Court Martial".