The illegal drug trade is a global black market, dedicated to cultivation, manufacturing, distribution, and sale of those substances which are subject to drug prohibition laws. Most jurisdictions prohibit trade, except under license, of many types of drugs by drug prohibition laws.

A UN report said the global drug trade generated an estimated US$321.6 billion in 2003. With a world GDP of US$36 trillion in the same year, the illegal drug trade may be estimated as slightly less than 1% (0.893%) of total global commerce.^{[citation needed]} Consumption of illegal drugs is widespread globally.