| 3rd Battalion, 25th Marines | |
|---|---|
 3/25 Insignia | |
| Active | May 1, 1943 – 1945 July 1, 1962 – present |
| Country |  United States of America |
| Branch |  United States Marine Corps |
| Type | Infantry battalion |
| Role | Locate, close with and destroy the enemy with fire and maneuver |
| Size | ~ 800 personnel |
| Part of | 25th Marine Regiment 4th Marine Division |
| Garrison/HQ | Brook Park, Ohio |
| Nickname(s) | "Three deuce five" "Cold Steel Warriors" |
| Motto(s) | Find A Way or Make One |
| Engagements | World War II |
| Commanders | |
| Current commander | Lt Col. Michael Thatcher |
3rd Battalion, 25th Marines (3/25) is a reserve infantry battalion in the United States Marine Corps. The battalion was first formed in 1943 for service in the Pacific Theater of Operations during World War II, taking part in a number of significant battles including those at Saipan and Iwo Jima before being deactivated at the end of the war. In the early 1960s, the unit was reactivated as a reserve battalion. Currently headquartered in Brook Park, Ohio with units throughout Ohio, Tennessee, and Pennsylvania, the battalion is nicknamed "three deuce five" and consists of approximately 800 Marines and Sailors. They fall under the 25th Marine Regiment and the 4th Marine Division. Recent operations have included tours in Iraq and Afghanistan.