Pleasant Adams Hackleman (November 15, 1814 – October 3, 1862) was a lawyer, politician and Union general who was killed during the American Civil War.

Hackleman and the 16th Indiana were sent to the Eastern Theater where they were engaged at the Battle of Ball's Bluff.

On April 28, 1862, he was promoted to brigadier general of volunteers and ordered to report to Ulysses S. Grant in the Western Theater.

Early in the fighting the Confederates forced a gap between Davies and General Thomas J. McKean's divisions and the Union line began to fall back.

At this point in the battle Hackleman attempted to rally his brigade and was shot through the neck.