Subcommander is a military rank used by organizations such as the Vulcan High Command and the Romulan Star Empire. In joint operations with Earth Starfleet, a Vulcan subcommander has been treated as being a grade below a Starfleet captain and above a Starfleet commander.

According to The Making of Star Trek (page 256) the Romulan rank of subcommander is fully equal to a Federation Starfleet captain.

List of subcommanders

Romulan Star Empire

• N'Vek
• Selok
• Tal
• Taris
• T'Rul
• Ustard
• Velal, aboard Deep Space 9 at end of Dominion War, 2375

Vulcan High Command

• Muroc
• T'Pol