Julius H. Stahel-Számwald (born Gyula Számwald; November 5, 1825 – December 4, 1912) was a Hungarian soldier who emigrated to the United States and became a Union general in the American Civil War.

Until the outbreak of the American Civil War, he worked for Deutsche illustrirte Familienblätter, a German-language newspaper in New York City.

Stahel first saw combat at the First Battle of Bull Run, leading the regiment in Blenker's first brigade of Dixon Miles's Fifth Division.

His brigade was of Fremont's left at the Battle of Cross Keys in which Stonewall Jackson stopped the Union advance into the Valley.

Stahel's position on the left exposed his command to a flank attack by Isaac Trimble's brigade as Fremont was attempting to turn the right of the Confederate line.

When the division joined the Army of the Potomac in June 1863, Alfred Pleasonton had Stahel removed, promoting Judson Kilpatrick in his place.

At the Battle of Piedmont on June 5, 1864, serving as cavalry commander under Maj. Gen. David Hunter, Stahel distinguished himself under fire until he was hit in the shoulder.

After the Civil War, Stahel served in the United States diplomatic corps as consul in Yokohama, (1866–1869) and Osaka, Japan (1877–1884).

Upon returning to the United States for reasons of health, Stahel worked for the Equitable Life Insurance Company in New York City.