TDY
From Infogalactic: the planetary knowledge core
TDY may refer to:
- TDY (book), written by Douglas Valentine (author), born 1949, among his other books, A Crow's Dream, The CIA as Organized Crime, The Hotel Tacloban, The Phoenix Program, The Strength of the Pack, The Strength of the Wolf, and With Our Eyes Wide Open.
- 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
- Temporary duty assignment, in the US military, an assignment at a location other than the person's permanent duty station
- Tour de Yorkshire, a four-day bicycle race in England
- WTDY-FM, a radio station in Philadelphia branded as "96.5 TDY"
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