TDO may refer to:
- TDO connector, the telephone plug used in Austria.
- The Delicious One, the mascot of the Wienerschnitzel restaurant
- Tryptophan 2,3-dioxygenase, an enzyme in the metabolism of tryptophan
- Tricho–dento–osseous syndrome, a rare genetic disorder affecting hair, teeth, and bones.
- Teen Dance Ordinance, a law in Seattle enacted after morality crusades against all-ages nightclubs.
This disambiguation page lists articles associated with the title TDO.
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