| 3rd Assault Amphibian Battalion | |
|---|---|
 3rd AABn Insignia | |
| Active | September 16, 1942 – present |
| Country |  United States of America |
| Branch |  United States Marine Corps |
| Type | Assault Amphibian Battalion |
| Role | Amphibious assault |
| Size | Over 1,000 Marines |
| Part of | 1st Marine Division I Marine Expeditionary Force |
| Garrison/HQ | Marine Corps Base Camp Pendleton Marine Corps Air Ground Combat Center Twentynine Palms, California |
| Nickname(s) | 3rd Tracks |
| Patron | Archangel Michael |
| Mascot(s) | Gator |
| Engagements | |
| Commanders | |
| Current commander | LtCol Daniel R. Petronzio |
3rd Assault Amphibian Battalion (3rd AABn) is one of two active duty assault amphibian battalions in the United States Marine Corps. The battalion is tasked with transporting US Marine forces and their equipment from assault ships to shore, and equipped with the Amphibious Combat Vehicle (ACV), which replaced the Amphibious Assault Vehicle (AAV). The battalion is part of the 1st Marine Division and the I Marine Expeditionary Force. The unit is based in Camp Pendleton in California.