Barclay Coppock (January 4, 1839 – September 4, 1861), also spelled "Coppac", "Coppic", and "Coppoc", was a follower of John Brown and a Union Army soldier in the American Civil War. Along with his brother Edwin Coppock (June 30, 1835 – December 16, 1859), he participated in Brown's raid on Harpers Ferry.