The 38th Field Artillery Regiment is a field artillery regiment of the United States Army.

On August 17, 1918, the 38th Field Artillery was organized as a regiment at Camp Lewis, Washington. It trained at that station until February 10, 1919, when the regiment was demobilized. Subsequently, on October 1, 1933, the 38th Field Artillery Regiment was reconstituted as an inactive unit of the regular Army.

The 38th Field Artillery next appears as a part of the Second Infantry Division. On October 10, 1939, the Fifteenth Field Artillery Regiment at Fort Sam Houston, Texas, was re-organized and given a 3rd battalion. Now, however, began the Army's program of modernization, which involved triangularization of the infantry division. in accordance with this program, the Fifteenth's 3rd Battalion was reconstituted as the Thirty-eighth Field Artillery Battalion on October 1, 1940.