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The 4th Division (第4師団) is one of nine active divisions of the Japan Ground Self-Defense Force. The division is subordinated to the Western Army and is headquartered in Kasuga, Fukuoka. Its responsibility is the defense of the Fukuoka, Nagasaki, Ōita and Saga prefectures.^[1]

The division was established on 15 August 1962.

Organization

4th Division, in Kasuga
- 4th Division HQ, in Kasuga
- Western Army Tank Unit, in Kusu, with two squadrons of Type 10 main battle tanks (administrative control during peacetime)
- 16th Infantry Regiment ^{note 1}, in Ōmura, with Type 96 Armored Personnel Carriers
- 40th Infantry Regiment, in Kitakyūshū
- 41st Infantry Regiment, in Beppu
- Tsushima Area Security Force, in Tsushima
- 4th Reconnaissance Combat Battalion, in Kasuga, with Type 16 Maneuver Combat Vehicles, and Type 87 armored reconnaissance vehicles
- 4th Anti-Aircraft Artillery Battalion, in Kurume, with Type 81 and Type 93 Surface-to-air missile systems
- 4th Engineer Battalion (Combat), in Ōmura
- 4th Signal Battalion, in Kasuga
- 4th Aviation Squadron, in Yoshinogari, flying UH-1J and OH-6D helicopters
- 4th NBC Protection Company, in Kasuga
- 4th Logistic Support Regiment, in Kasuga
  - 1st Maintenance Battalion
  - 2nd Maintenance Battalion
  - Supply Company
  - Medical Company
  - Transport Company

note 1: Infantry Regiments have only battalion strength.