TD status ("Treaty national's dependent", or "Trade NAFTA dependent"), the immigration status of family members of a Canadian or Mexican citizen working in the USA under the NAFTA agreement
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
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