The Southwest Area Fleet was an operational command of the Imperial Japanese Navy established on April 10, 1942 to coordinate naval, air, and ground forces for the invasion, occupation and defense of the Philippines, French Indochina, Malaya, and the Netherlands East Indies.
After February 1945, the headquarters of the Southwest Area Fleet was isolated in the Philippines, and the IJN 10th Area Fleet was created in Singapore to take over operational command of its surviving forces, with the exception of the 3rd Southern Expeditionary Fleet, which was also trapped in the Philippines. Through fierce fighting during the American re-occupation of the Philippines, especially in Manila, Cebu and Mindanao, the surviving elements of the Southwest Area Fleet and the 3rd Southern Expeditionary Fleet were largely annihilated by the end of May 1945.
- Southwest Area Fleet (HQ Manila)
- First Expeditionary Fleet (Singapore)
- Second Expeditionary Fleet (Surabaya)
- Third Expeditionary Fleet (Manila)
- Fourth Expeditionary Fleet (Ambon)
- IJN 13th Air Fleet
Commanders of the IJN Southwest Fleet
Commander in chief 
|1||Vice Admiral||Ibo Takahashi||10 Apr 1942 – 15 Sep 1942|
|1||Admiral||Shiro Takasu||15 Sep 1942 – 18 Jun 1944|
|1||Vice Admiral||Gunichi Mikawa||18 Jun 1944 – 1 Nov 1944|
|1||Vice Admiral||Denshichi Okawauchi||1 Nov 1944 – 15 Sep 1945|
Chief of staff
|1||Vice-Admiral||Toshihisa Nakamura||10 Apr 1942 – 10 Oct 1942|
|2||Vice-Admiral||Takeo Tada||10 Oct 1942 – 15 Mar 1944|
|3||Rear-Admiral||Hidehiko Nishio||15 Mar 1944 – 1 Nov 1944|
|4||Vice-Admiral||Kaoru Arima||1 Nov 1944 – 6 Sep 1945|
- D'Albas, Andrieu (1965). Death of a Navy: Japanese Naval Action in World War II. Devin-Adair Pub. ISBN 0-8159-5302-X.
- Dull, Paul S. (1978). A Battle History of the Imperial Japanese Navy, 1941-1945. Naval Institute Press. ISBN 0-87021-097-1.
- Wendel, Marcus. "Axis History Database". http://www.axishistory.com/index.php?id=7833. Retrieved 2007-08-25.
- D'Albas, Death of a Navy
- Wendel, Axis History Database
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