The 11th Pennsylvania Infantry Regiment was a Union army regiment that participated in the American Civil War. It had the distinction of being the oldest unit in continuous service from Pennsylvania.

Richard Coulter, Sr. was an American Civil War Colonel and brevet brigadier general of volunteers in the Union Army, a businessman, and banker. During the Civil War he was colonel of the 11th Pennsylvania Infantry, often rising to brigade command upon the wounding of superior officers. In 1866, he was nominated and confirmed as a brevet major general of volunteers to rank from April 1, 1865.