The Patterson–Gimlin film (also referred to as simply the Patterson film) is a famous short motion picture of an unidentified subject the film makers purported to be a "Bigfoot", that was supposedly filmed on October 20, 1967, by Roger Patterson (February 14, 1926 – January 15, 1972) and Robert "Bob" Gimlin (born October 18, 1931) on Bluff Creek, a tributary of the Klamath River about 25 road miles north-west of Orleans, California. The film has been subjected to many attempts both to debunk and authenticate it. Most scientists have judged the film a hoax with a man in an ape suit, but many Bigfoot believers contend the film depicts a cryptid, a creature unknown to science.
Both Patterson and Gimlin have always insisted they encountered and filmed a real Bigfoot, not a man in a costume. Patterson died of cancer in 1972. Patterson's friend and business associate, Gimlin, has always denied being involved in any part of a hoax with Patterson. Gimlin avoided publicly discussing the subject from at least the early 1970s until about 2000 when he began giving interviews and making appearances at Bigfoot conferences.