The 2007 San Francisco Bay oil spill was an oil spill that happened on 7 November 2007 at San Francisco, California, in which 58,000 gallons (220,000 litres) of IFO-380 bunker fuel spilled into San Francisco Bay after the container ship COSCO Busan struck the San Francisco – Oakland Bay Bridge in thick fog.

California Governor Arnold Schwarzenegger declared a state of emergency after meeting federal, state and local officials overseeing the cleanup. The proclamation made additional state personnel, funding and equipment available to assess and clean up the environmental damage.

Senator Barbara Boxer and San Francisco Mayor Gavin Newsom criticized the Coast Guard for its response, as its initial reported figures, between 100 and 400 gallons of oil, were significantly lower than those of the actual spill.