John Decatur Barry (June 21, 1839 – March 24, 1867) was an officer in the Confederate States Army during the American Civil War.

[1] Barry enlisted in Company I of the 18th North Carolina Infantry when the Civil War began.

At the Battle of Chancellorsville, Barry gave the order to fire on Stonewall Jackson's party as they attempted to ride through James H. Lane's brigade, believing they were Union cavalry.

[1] Lane was wounded at the Battle of Cold Harbor on June 2 and Barry was appointed brigadier general (temporary) to replace him.

Because he was disabled and after Lane returned to lead the brigade, the temporary appointment to brigadier general was canceled.