William Sullivan "Sully" Beebe (February 14, 1841 – October 12, 1898) was a Union officer who received the Medal of Honor on June 30, 1897 for his action at Cane River Crossing, Louisiana on April 23, 1864.

[1] Born in Ithaca, New York, Beebe graduated from West Point in 1863, receiving his commission in the ordnance branch.

[2][3] Beebe rejoined the Army at the start of the Spanish–American War in June 1898, and served as chief ordnance officer, with the rank of major, on the staff of general James F. Wade.

[4][5] Beebe was a companion of the New York Commandery of the Military Order of the Loyal Legion of the United States.

Beebe was the nephew of John Charles Casey (1809–1856), West Point Class of 1829.