Leslie Joy Whitehead (Serbian Cyrillic: Лесли Џој Вајтхед, February 26, 1895 – June 5, 1964), known as Josephine, Joy, or Jo, was a Canadian female soldier during the First World War. Whitehead was one of a small number of women from the western world to enter the frontlines as a combatant during World War I after she enlisted as a man in the Royal Serbian Army at the age of 22. During her time on the Balkan Front, she would go on to work as a military engineer, a guard for the Scottish Women's Hospitals, and become a prisoner of war under the Bulgarian Army following the invasion of Belgrade on October 8, 1915.