| 1st Battalion, 503rd Infantry Regiment | |
|---|---|
 Coat of arms | |
| Active | 1941–45 1951–84 1986–2005 2006–present |
| Country |  United States |
| Branch |  United States Army |
| Type | Infantry |
| Role | Airborne |
| Size | Battalion |
| Part of | 173rd Airborne Brigade Combat Team |
| Nickname(s) | First Rock |
| Engagements | World War II Vietnam War Operation Enduring Freedom Operation Iraqi Freedom |
| Commanders | |
| Battalion Commander | LTC Joe Branch |
| Command Sergeant Major | CSM Bryan O'Neal |
| Insignia | |
| Distinctive unit insignia |  |
| Beret flash |  |
The 1st Battalion, 503rd Infantry Regiment (1–503rd IR) is an active duty airborne infantry battalion in the United States Army, assigned to the 173rd Airborne Brigade Combat Team and stationed in Vicenza, Italy. The battalion has served with the 2nd Infantry Division, the 11th Airborne Division, the 24th Infantry Division, the 82nd Airborne Division, and the 173rd Airborne Brigade; has been stationed in Korea, Italy and the United States; and earned campaign credits in World War II, the Vietnam War, Operation Enduring Freedom-Afghanistan, and Operation Iraqi Freedom.