The Battle of Coral–Balmoral was a series of actions fought during the Vietnam War between the 1st Australian Task Force and the North Vietnamese People's Army of Vietnam (PAVN) 7th Division and Viet Cong (VC) Main Force units, 40 kilometres (25 mi) north-east of Saigon. Following the defeat of the PAVN/VC Tet offensive in January and February, in late April two Australian infantry battalions—the 1st and 3rd Battalions of the Royal Australian Regiment (RAR)—with supporting arms, were again deployed from their base at Nui Dat in Phước Tuy Province to positions astride infiltration routes leading to Saigon to interdict renewed movement against the capital. Part of the wider allied Operation Toan Thang I, it was launched in response to intelligence reports of another impending PAVN/VC offensive, yet the Australians experienced little fighting during this period. Meanwhile, the PAVN/VC successfully penetrated the capital on 5 May, plunging Saigon into chaos during the May Offensive in an attempt to influence the upcoming Paris peace talks scheduled to begin on the 13th. During three days of intense fighting the attacks were repelled by US and South Vietnamese forces, and although another attack was launched by the PAVN/VC several days later, the offensive was again defeated with significant losses on both sides, causing extensive damage to Saigon and many civilian casualties. By 12 May the fighting was over, and the PAVN/VC were forced to withdraw having suffered heavy casualties. US casualties were also heavy and it proved to be their most costly week of the war.

The 1st Australian Task Force was a brigade-sized formation which commanded Australian and New Zealand Army units deployed to South Vietnam between 1966 and 1972. 1 ATF was based in a rubber plantation at Nui Dat, 8 kilometres (5.0 mi) north of Bà Rịa in Phuoc Tuy Province and consisted of two and later three infantry battalions, with armour, aviation, engineers and artillery support. While the task force was primarily responsible for securing Phuoc Tuy Province, its units, and the Task Force Headquarters itself, occasionally deployed outside its Tactical Area of Responsibility.