Abel G. Cadwallader (1841 – July 6, 1907) was a Union Army soldier in the American Civil War who received the U.S. military's highest decoration, the Medal of Honor, for his actions at the Battle of Hatcher's Run.

He served as a corporal in Company H of the 1st Regiment Maryland Volunteer Infantry.

During the Battle of Hatcher's Run in Virginia on February 6, 1865, Cadwallader "[g]allantly planted the colors on the enemy's works in advance of the arrival of his regiment."

[1][2] Cadwallader reached the rank of sergeant before leaving the army in July 1865.

He died on July 6, 1907, and was buried at Loudon Park Cemetery in Baltimore.