Outlaw motorcycle clubs (OMCs), also referred to as outlaw motorcycle gangs (OMCGs), such as the iconic Hells Angels MC, emerged as a subculture after World War II in the United States, being attractive to a number of veterans. The clubs were originally outlaws from the motorcycle club community rather than the law. The “1%” patch that distinguishes these clubs as outlaw motorcycle clubs dates back to the infamous Hollister riot in 1947 during the Annual Gypsy Tour motorcycle rally organized by the American Motorcycle Association (AMA), following which AMA is said to have stated that 99 percent of motorcyclists were law-abiding and that the riot was caused by the 1 percent of deviant law-breakers. The AMA has denied this statement, but the 1% patch has since been worn as a badge of honor, and outlaw motorcycle clubs came to be known as “One Percenters.” The subculture grew over the following decades, as clubs established chapters in new localities in the United States and in the 1960s began their transnational expansion, which accelerated in the 1980s and 1990s. Simultaneously, they became a powerful figment of popular culture and have ever since straddled the fine line between fact and fiction, reinforcing their “power mystique.” The most influential outlaw motorcycle clubs, such as Hells Angels MC, Outlaws MC, and Bandidos MC, have morphed into strong transnational organizations, counting thousands of members worldwide. These clubs have, through skillful self-commodification and branding, inspired the global growth of the 1% subculture and a worldwide proliferation of outlaw motorcycle clubs with the same organizational structures, laws and by-laws, core values, and marks of distinction: the three-piece patches consisting of a club logo, top rocker with the name of the club, and bottom rocker with location, along with the 1% patch. OMCs have been connected to a broad specter of illegal and criminal activities and are considered organized crime groups by law enforcement agencies worldwide. Considerable resources are channeled into the fight against these groups. Despite the size of the phenomenon, criminological research on outlaw motorcycle clubs has been limited and is still dominated by studies from United States, New Zealand, and Australia, albeit growing recently in Europe. This bibliography includes references to key works from criminology and related disciplines, such as anthropology of crime, as well as literature concerned with the policing of OMCs. While there are numerous accounts of OMC life written by (ex-)members and undercover agents that can be of interest to researchers, this bibliography summarizes only high-quality research.