William Sullivan Peirce (May 16, 1864 – July 10, 1923) was a United States Army officer in the late 19th and early 20th centuries.

He attained the rank of brigadier general, and after the war served as the Army's Assistant Chief of Ordnance.

He studied at the University of Vermont from 1881 to 1884 and took part in the school's military instruction program, where he attained the rank of cadet sergeant major.

[4] Peirce received the Army Distinguished Service Medal for his actions during World War I, the citation for which reads: The President of the United States of America, authorized by Act of Congress, July 9, 1918, takes pleasure in presenting the Army Distinguished Service Medal to Brigadier General William Sullivan Peirce, United States Army, for exceptionally meritorious and distinguished services to the Government of the United States, in a duty of great responsibility during World War I.

While in charge of the Springfield Arsenal, Colonel Peirce's exceptional ability contributed materially to increasing the output of small arms.