The Oakland Cannabis Buyers' Cooperative (OCBC) is a California organization whose mission is to "provide seriously ill patients with a safe and reliable source of medical cannabis information and patient support." In order to become a member, a person must provide a note from a treating physician assenting to cannabis therapy for a medical condition listed on the Medicinal Cannabis User Initial Questionnaire. Those conditions range from severe disabilities such as multiple sclerosis and cerebral palsy to relatively minor conditions such as menstrual cramps.

This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (June 2019)

To protect the OCBC from federal interference, Oakland, California established growing and possession guidelines and declared the OCBC an agent of the city. On May 14, 2001, however, the United States Supreme Court ruled in United States v. Oakland Cannabis Buyers' Coop that federal anti-drug laws do not permit an exception for medical marijuana.

• Chorney, Jeff: Pot Raids Stir SF Protests, Oakland Tribune, Feb. 13, 2002.
• US Supreme Court Upholds Bankrupt Federal Law on Medical Marijuana - State Law Not Affected, California NORML, May 14, 2001.

• *Oakland Cannabis Buyers Cooperative Archived 2005-02-19 at the Wayback Machine