Air Service, United States Army Lieutenant Orville Alfred Ralston (September 9, 1894 – December 30, 1942) was a World War I flying ace credited with five aerial victories.

He flew a Royal Aircraft Factory SE.5a in "Mick" Mannock's flight of 85 Squadron, and gained his first two victories there, destroying a Fokker D.VII each on July 24 and August 22, 1918.

He teamed with fellow ace Elliott White Springs and two other pilots for his next win, and then independently destroyed two more D.VIIs—one each on September 26 and October 3, 1918.

Having engine trouble, Lieutenant Ralston signaled his flight commander, left his formation, and started for the lines.

Four more Fokkers now attacked Lieutenant Ralston, but he managed to get back in the clouds and return safely to our lines, as did the rest of his flight.