The 31st Training Squadron () is a unit of the Japan Air Self-Defense Force. It comes under the authority of the 1st Air Wing of Air Training Command. It is based at Hamamatsu Air Base in Shizuoka Prefecture. Thompson, Paul JASDF - Order of Battle July 1, 2017 J-HangarSpace Retrieved October 22, 2017 Thompson, Paul JASDF - Squadron Histories J-HangarSpace Retrieved October 22, 2017 It is equipped with Kawasaki T-4 aircraft.

Aircraft operated Kawasaki T-4 (1989–present)

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