The Western New Guinea campaign was a series of actions in the New Guinea campaign of World War II. United States and Australian forces assaulted Japanese bases and positions in the north-west coastal areas of Netherlands New Guinea and adjoining parts of the Australian Territory of New Guinea. The campaign began with Operations Reckless and Persecution, which were amphibious landings by the U.S. I Corps at Hollandia and Aitape on April 22, 1944. Fighting in western New Guinea continued until the end of the war.

Major battles and sub-campaigns

• Operations Reckless and Persecution
• Battle of Wakde
• Battle of Lone Tree Hill (1944)
• Battle of Morotai
• Battle of Biak
• Battle of Noemfoor
• Battle of Driniumor River
• Battle of Sansapor
• Aitape-Wewak campaign