| 1st Battalion, 23rd Marines | |
|---|---|
 1st Battalion, 23rd Marines insignia | |
| Active | 1942 |
| 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 | 1000 |
| Part of | 23rd Marine Regiment 4th Marine Division |
| Garrison/HQ | Houston, Texas |
| Nickname(s) | "Lone Star" |
| Anniversaries | 10 November 1775 Birthday of the Marine Corps |
| Engagements | World War II |
| Commanders | |
| Current commander | LtCol Walt E. Larisey |
1st Battalion, 23rd Marines (1/23) is one of 32 infantry battalions in the United States Marine Corps, and one of only eight battalions found in the reserve. It is located throughout Texas and Louisiana consisting of approximately 1000 Marines and Sailors. They fall under the command of the 23rd Marine Regiment and the 4th Marine Division.