The United States Anti-Doping Agency is a organisation and the national anti-doping organisation of the United States of America. The organisation was created in 1999.

The organisation controlled the anti doping programmes for the Olympic games. Its work includes in-competition and out-of-competition testing, the results management and adjudication process, the provision of drug reference resources, the therapuetic use exemption process, other scientific research initiatives, and campagins, such as educational presentations for athlets.

USADA is headquartered in Colorado Springs, Colorado.