TDG may refer to:
Businesses
edit- TDG Limited, a UK logistics and distribution company
- Traffic Design Group, a New Zealand consultancy
- TransDigm Group, NYSE ticker symbol
Law
edit- Transportation of Dangerous Goods Act, 1992, a Canadian law
Science
edit- Transient directing group in organic chemistry
- Thymine-DNA glycosylase, an enzyme
Others
edit- Tandag Airport's IATA code