| 12th Marine Littoral Regiment | |
|---|---|
 12th Marine Littoral Regiment Insignia | |
| Active | 4 October 1927 – 1945 17 March 1952 - present |
| Country |  United States of America |
| Branch |  United States Marine Corps |
| Type | Littoral Regiment |
| Role | Provide fires in support of 3rd Marine Division |
| Part of | 3rd Marine Division |
| Garrison/HQ | Camp Smedley Butler, Okinawa, Japan |
| Nickname(s) | Thunder and Steel |
| Motto(s) | Honor, Fidelity, Valor |
| Engagements | World War II |
| Commanders | |
| Current commander | Colonel Peter B. Eltringham |
| Notable commanders | Donald M. Weller Clifford B. Drake |
The 12th Marine Littoral Regiment is a Littoral regiment of the United States Marine Corps based at Camp Smedley Butler, Okinawa, Japan. Nicknamed "Thunder and Steel," the regiment falls under the command of the 3rd Marine Division.