TDG

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

 * Transient directing group in organic chemistry
 * Thymine-DNA glycosylase, an enzyme