The 50th Battalion was an infantry battalion of the Australian Army. It was originally raised in 1916 for service during the World War I and took part in the fighting in the trenches of the Western Front in France and Belgium before being amalgamated with the 51st Battalion in early 1919 following the German Spring Offensive reduced the numbers in both battalions. After the war, the battalion was briefly reformed as a part-time unit based initially in South Australia and then later in Tasmania. At different periods it was amalgamated with both the 10th and 12th Battalions. The battalion did not see combat during World War II, and it was disbanded in mid-1945.