TD may stand for:
On laboratory glassware such as pipets, "to deliver"
Atlantis European Airways, IATA airline designator
TD, one of four official mascots of the Cleveland Browns
T.D., the official mascot of the Miami Dolphins
Toronto-Dominion Bank, one of Canada's major banking corporations
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
TeamDocuments - web application used to manage electronic documentation in asyncronous mode among many users.
Technical Director, theatrical, cinematographic, and visual effects term
Telstra Dome, Australian Football League venue
Temporal Difference, TD-Learning algorithm
Tenacious D, a comedy rock duo
Terrell Davis, a retired American football running back
Territorial Decoration, awarded for twelve years' service in the British Territorial Army
Terry Daniher, former Essendon
Source:
http://en.wikipedia.org/wiki/T D