TD

TD may stand for:

*Atlantis European Airways designator
*T.D. (mascot), official mascot of the Miami Dolphins
*Toronto-Dominion Bank, one of Canada's major banking corporations, owner of the TD.com domain
*Tangerine Dream, seminal German krautrock group
*Tank destroyer
*Tardive dyskinesia, serious adverse effects usually caused by older antipsychotic drugs
*Teachta Dála, member of lower house of Irish Parliament, Dáil Éireann
*Technical director, a senior technical person in an organisation
*Telstra Dome, Australian Football League venue
*Temporal difference learning, a prediction method
*Tenacious D, a comedy rock duo
*Territorial Decoration, awarded for twelve years' service in the British Territorial Army
*Test Drive (video game), driving simulation game
*Tex Dinoco, character in Cars
*Three Delivery, and American anime series on Nicktoons Network
*Tibial dyschondroplasia, a metabolic poultry disease
*Timothy Dwight, a residential college at Yale University
*Total Distortion, a 1995 computer/mac adventure game
*Tower defense, a genre of video games in which players repel enemies by strategically placing defensive towers
*Tower Dream, a Super Famicom video game
*Tracking (dog)
*Traveler's diarrhea, an intestinal illness contracted by international travelers
*Trenton Devils, an ECHL ice hockey team formerly known as the Trenton Titans
*Tropical depression, a weather system which is the predecessor of typhoon, cyclone or hurricane
*Trust deed
*Turbo diesel
*Treasury Department
*MG TD, a car manufactured in the United Kingdom between 1950 and 1953

TD or td may stand for:
*Touchdown
*Country codes:
**Chad — ISO 2-letter country code (see List of ISO country codes), and country code top-level domain .td from the country's French-language spelling, "Tchad"
**Trinidad and Tobago, List of NATO country codes 2-letter country code
*<td> (table cell delimiter tag), see HTML element#Tables

Td may stand for:
*Tetanus and diphtheria vaccine
*Townsend (unit) physical unit of E/N
*Troland, a unit of retinal illuminance

"td" in lowercase may refer to the first self-splicing group I intron discovered in "E. coli". "td" is an abbreviation for thymidylate synthase.

T_d may stand for:
*Dew point temperature; the temperature when saturation occurs (100% relative humidity)