The 1st Division (第1師団, Dai-Ichi Shidan) is one of nine active divisions of the Japan Ground Self-Defense Force. The division is subordinated to the Eastern Army and is headquartered at Camp Nerima in Nerima, Tokyo. Its responsibility is the defense of Tokyo and the Chiba, Ibaraki, Kanagawa, Saitama, Shizuoka and Yamanashi prefectures.

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1st Division
第1師団
1st Division Distinctive Unit Insignia
Active	18 January 1962 – present
Country	Japan
Branch	Japan Ground Self-Defense Force
Type	Infantry division
Size	6,500 soldiers (As of 2023)
Part of	Eastern Army
Garrison/HQ	Camp Nerima, Nerima, Tokyo
Nickname(s)	Leader Division (頭号師団)
Commanders
Current commander	Lt. Gen. Yasuyuki Kodama

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The division was raised on 18 January 1962 but dates back to the 1st District Corps (Tokyo) of the then National Police Reserve formed in 1950 and reformed in 1962 as an Infantry Division.

• Camp Nerima at Nerima, Tokyo
  • 1st Division Headquarters Company
  • 1st Infantry Regiment (Japanese)
  • 1st Logistic Support Regiment (Japanese)
    • 1st Maintenance Battalion
    • 2nd Maintenance Battalion
    • Supply Unit
    • Medical Unit
    • Transport Unit
  • 1st NBC Weapon Defense Company
  • 1st Band
• Camp Asaka at Asaka
  • 1st Engineer Battalion (Combat) (Japanese)
  • 1st Reconnaissance Combat Battalion (Japanese), with Type 87 armored reconnaissance vehicles and Type 16 Maneuver Combat Vehicles^[1]
• 1st Antiaircraft Artillery Battalion (Japanese), with Type 81 and Type 93 Surface-to-air missile systems at Camp Komakado in Gotemba
• 32nd Infantry Regiment (Japanese), at Camp Ōmiya in Saitama
• 34th Infantry Regiment (Japanese), at Camp Itazuma in Gotemba
• 1st Aviation Squadron, at Tachikawa Airfield, flying UH-1J and OH-6D helicopters