The 2/18th Battalion was an Australian Army infantry unit that served during World War II. Formed in June 1940, the battalion was assigned to the 22nd Brigade, which formed part of the Australian 8th Division. After completing basic training, the 2/18th was sent to Singapore and Malaya to strengthen the defences of the British colonies in February 1941 against a possible Japanese attack. The 2/18th Battalion subsequently undertook garrison duties throughout the year at various locations in Malaya, where it conducted jungle training and constructed defences along the eastern coast.

The 22nd Brigade was a brigade-sized infantry unit of the Australian Army. It was briefly raised in 1912 as a Militia formation providing training as part of the compulsory training scheme. Later, during World War II, the brigade was raised as part of the all volunteer Second Australian Imperial Force in April 1940. Assigned to the 8th Division, in early 1941 the brigade was deployed to British Malaya, where it formed part of the defensive garrison that was established there by the British, eventually establishing its headquarters in the Mersing–Endau area.