4th Division
4th Division Distinctive Unit Insignia
Active	15 August 1962 – present
Country	Japan
Branch	Japan Ground Self-Defense Force
Type	Infantry division
Size	about 8000 soldiers
Part of	Western Army
Garrison/HQ	Kasuga
Commanders
Current commander	Lt. Gen. Akira Fukatsu

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.