Trafficking in dangerous drugs refers to the sale of dangerous drugs for a commercial purpose. The distinction between supplying dangerous drugs and trafficking dangerous drugs is that drugs are being sold for a commercial purpose.

The type of penalty an individual may expose themselves to if convicted of trafficking dangerous drugs is largely dependent on the drug they are said to have been trafficking in, the duration of the trafficking period, the number of transactions, and the profit derived from the trafficking. Lengthy periods of imprisonment are often imposed for those convicted of more serious examples of trafficking dangerous drugs.