San Francisco Express Times was a counterculture tabloid underground newspaper edited by Marvin Garson and published weekly in San Francisco, California from January 24, 1968, to March 25, 1969, for a total of 62 issues, covering and promoting radical politics, rock music, arts and progressive culture in the Bay Area. It was a member of the Underground Press Syndicate, and sold for 15 cents.

The terms underground press or clandestine press refer to periodicals and publications that are produced without official approval, illegally or against the wishes of a dominant group. In specific recent Asian, American and Western European context, the term "underground press" has most frequently been employed to refer to the independently published and distributed underground papers associated with the counterculture of the late 1960s and early 1970s in India and Bangladesh in Asia, in the United States and Canada in North America, and the United Kingdom and other western nations. It can also refer to the newspapers produced independently in repressive regimes. In German occupied Europe, for example, a thriving underground press operated, usually in association with the Resistance. Other notable examples include the samizdat and bibuła, which operated in the Soviet Union and Poland respectively, during the Cold War.