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TDY may refer to:

  • Temporary duty assignment, in the US military, an assignment at a location other than the person's permanent duty station
  • Teledyne Technologies, an American conglomerate with the stock symbol "TDY", involved in digital imaging, instrumentation, systems engineering, and electronics for the aerospace and defense industries
  • WTDY-FM, a radio station in Philadelphia branded as "96.5 TDY"
  • Tour de Yorkshire, a four-day bicycle race in England