William Ransom Johnson Pegram, known as "Willie" or "Willy", (June 29, 1841 – April 2, 1865) was an important young artillery officer in Robert E. Lee's Confederate Army of Northern Virginia during the American Civil War. He was mortally wounded in the Battle of Five Forks. He was the younger brother of Confederate General John Pegram, who was also killed in action. His grandfather, John Pegram, was a major general during the War of 1812.