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