| 4th Light Armored Reconnaissance Battalion | |
|---|---|
 4th LAR Insignia | |
| Founded | September 23, 1987 |
| Country |  United States of America |
| Branch |  United States Marine Corps |
| Type | Armored reconnaissance battalion |
| Role | Screen in advance of maneuver units |
| Part of | 4th Marine Division Marine Forces Reserve |
| Garrison/HQ | Marine Corps Base Camp Pendleton |
| Nickname(s) | Iron Horse Marines |
| Mascot(s) | Neapolitan Mastiff |
| Engagements | Operation Desert Storm Iraq War War in Afghanistan (2001-2021) |
4th Light Armored Reconnaissance Battalion (4th LARB) is a United States Marine Corps Light Armored Reconnaissance battalion of the Marine Corps Reserve. Their primary weapon system is the LAV-25 and they are part of the 4th Marine Division and Marine Forces Reserve. The unit headquarters is at Camp Pendleton, California, but other units in the battalion are located throughout the United States. 4th LAR Bn is the largest combat battalion in the Marine Corps, with 7 companies.