The 20th Battalion was an infantry battalion of the New Zealand Military Forces, which served during the Second World War as part of the 2nd New Zealand Division. During the war it was converted to an armoured regiment.
The 20th Battalion was formed in New Zealand in 1939 under the command of Lieutenant Colonel Howard Kippenberger. After a period of training it embarked for the Middle East and then onto Greece in 1941 as part of the 2nd New Zealand Division. It participated in the Battles of Greece and later in Crete. Evacuated from Crete, it then fought in the North African Campaign. It suffered heavy losses during Operation Crusader, when it was effectively destroyed by the 15th Panzer Division. Brought back up to strength, the battalion played a key role in the breakout of the 2nd New Zealand Division from Minqar Qaim in June 1942, where it had been encircled by the 21st Panzer Division. The following month, the battalion suffered heavy casualties during the First Battle of El Alamein.
In October 1943, the battalion was converted to an armoured unit and designated 20th Armoured Regiment.