James Brewerton Ricketts (June 21, 1817 – September 22, 1887) is a career officer in the United States Army, serving as a Union Army general during the Civil War.

At First Bull Run, he is wounded and captured, but later exchanged.

He fights at Second Bull Run and Antietam, where he is badly injured when his horse falld on him.

While recuperating, he serves on the Fitz John Porter court-martial, a highly political case, where his loyalties are believed to have cost him promotion.

Later he commands a division in the Overland campaign, and a corps in the Shenandoah Valley Campaign under Sheridan, where he receives a chest wound at Cedar Creek that disables him for life.