The 23rd Battalion, also known as the Canterbury-Otago Battalion, was an infantry battalion of the New Zealand Military Forces during the Second World War. Formed in November 1939 as part of the 5th Brigade, 2nd Division of the 2nd New Zealand Expeditionary Force. After undertaking training at Burnham Camp the battalion sailed from New Zealand on the 1 May 1940. The battalion saw action in Greece, Crete, North Africa, and Italy.
- Ross, Angus (1959). 23 Battalion. The Official History of New Zealand in the Second World War 1939–1945. Wellington, New Zealand: Historical Publications Branch.