Elihu Harlam Mason (March 23, 1831 – September 24, 1896) was a Union Army soldier in the American Civil War and a recipient of the United States military's highest decoration, the Medal of Honor, for his actions in the Great Locomotive Chase.

The remaining raiders, including Mason, made an escape from the Confederate prison on October 16, 1862.

Very ill at the time, Mason was unable to keep up with the other soldiers and, at his own urging, was eventually left behind and recaptured by the Confederates.

[2] For his actions during the mission, he was awarded the newly created Medal of Honor one week after being exchanged, on March 25, 1863.

[4] Mason's official Medal of Honor citation reads: One of the 19 of 22 men (including 2 civilians) who, by direction of Gen. Mitchell (or Buell), penetrated nearly 200 miles south into enemy territory and captured a railroad train at Big Shanty, Ga., in an attempt to destroy the bridges and track between Chattanooga and Atlanta.