T31 may refer to:
- Aero Country Airport, in McKinney, Texas
- General Electric T31, an American turboprop engine
- German torpedo boat T31
- Komagawa-Nakano Station, in Higashisumiyoshi-ku, Osaka, Japan
- Slingsby T.31 Tandem Tutor, a British military training glider
- T31 cannon, an aircraft weapon
- Type 31 frigate, a planned class of frigates for the Royal Navy
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