Commander

In One Piece "Commander" (中佐) is a marine officer rank below Captain and above Lieutenant Commander.

Pirate Commanders
Some pirate crews, such as Whitebeard's crew, are so big that they're divided into different divisions with a powerful commander leading each one.

Known Whitebeard Pirate Division Commanders (sixteen):
 * 1st Division Commander: Marco
 * 2nd Division Commander: Portgas D. Ace - Deceased; killed by Admiral Sakazuki
 * 3rd Division Commander: Jozu
 * 4th Division Commander: Thatch - Deceased; killed by Teach
 * 5th Division Commander: Vista
 * 10th Division Commander: Curiel
 * 13th Division Commander: Atmos
 * ??? Division Commander: Blenheim