TDO

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.