The Mongols Motorcycle Club, shortened to "Mongols MC" is a motorcycle club headquartered in southern California that was originally formed in Montebello, California in the 1970s.[1]. Law enforcement officials estimate there are approximately 350 members. In addition to their presence in southern California, the club claims chapters in Nevada, Oklahoma, Colorado, Arizona, Montana, Oregon, New York, Indiana, Canada, and Mexico. . Norwegian mainstream news also reports that Mongols has spread to Scandinavia, April 2008.

The Mongols motorcycle club is named after the ethnic group the Mongols that conquered the largest contiguous empire in world history. The Mongols MC main website includes a quote from Genghis Khan, the founder of the Mongol Empire on the front page. There is no other relationship between the ethnic group the Mongols and the Mongols motorcycle club other than the shared name.
1998, ATF agent William Queen infiltrated the club, eventually becoming a full-patch member and rising to the rank of treasurer using the undercover alias of Billy St. John. In April of 2000, based on evidence gathered during Queen's 28-month undercover tenure with the club, 55 Mongols were arrested and later all but one of the accused were convicted of various crimes including drug trafficking, motorcycle theft, and conspiracy to commit murder.

In 2002, members of the Mongols and the Hells Angels had a confrontation in Laughlin, Nevada at the Harrah's Laughlin Casino, that left three bikers dead. Some police intelligence reports indicate that the Mongols initiated the confrontation to bolster their status Mongol Anthony Barrera, 43, was stabbed to death, and two Hells Angels, Jeramie Bell, 27, and Robert Tumelty, 50, were shot to death. On February 23, 2007, Hells Angel members James Hannigan and Rodney Cox were sentenced to two years in prison for their respective roles in the incident. Cox and Hannigan were captured on videotape confronting members of the rival Mongols motorcycle club inside the casino. A Hells Angel member can be clearly seen on the casino security videotape performing a front kick on a Mongol biker member which in turn started the ensuing melee.

Attorneys for the Hells Angels claim they were defending themselves from an attack initiated by the Mongols.

Charges were dismissed against 36 other Mongols originally named in the indictment.

The Mongols are currently listed as an Outlaw Motorcycle Gang by the Attorney General of California