12th Littoral Logistics Battalion (LLB-12), formerly known as Combat Logistics Battalion 12 and previously 3rd Transportation Support Battalion (3d TSB), is a direct support (DS) logistics unit of the United States Marine Corps and is headquartered at Camp Hansen, Okinawa, Japan.

The unit falls under the command of 12th Marine Littoral Regiment.

12th Littoral Logistics Battalion provides direct support and tactical logistics to 12th Marine Littoral Regiment beyond its organic capabilities.

9th Motor Transport Battalion was activated at Marine Corps Base Camp Pendleton, California on June 25, 1953..

[2] On March 23 2021, 3d TSB was redesignated as 3d Transportation Battalion.