A motorcycle club is a group of individuals whose primary interest and activities involve motorcycles.

Motorcycle clubs vary a great deal in their objectives and organizations. Mainstream motorcycle clubs or associations typically have elected officers and directors, annual dues, and a regular publication. They may also sponsor annual or more frequent "rallies" where members can socialize or specific sports events.

There are a great many "brand clubs", i.e. clubs dedicated to a particular marque, including those sponsored by various manufacturers, such as the Harley Owners Group, the Honda Riders Club of America and some independent, such as the Triumph Owners' Motor Cycle Club. There are large national independent motorcycle clubs, such as BMW Motorcycle Owners of America, the STAR Touring and Riding Association, and the Gold Wing Road Riders Association (GWRRA). There are also specific clubs for women, such as Women's International Motorcycle Association, Leather and Lace MC and Women in the Wind MC, and clubs for lesbians and gays, such as Dykes on bikes.

The Milperra Massacre was a firearm battle between rival motorcycle gang members on September 2 (Father's Day) 1984, in Milperra, a south-western suburb of Sydney. The massacre had its beginnings after a group of Comancheros broke away and formed the first Bandidos Motorcycle Club chapter in Australia resulting in intense rivalry between the two chapters. Seven people were killed: six motorcycle gang members and a fourteen year old female bystander.

Police believe that the war began over turf or drugs, however, the clubs at that time had a strong no drugs policy and Colin Ceasar Campbell, former Sergeant-at-Arms of the Harris Park based Comancheros and then President of the Birchgrove chapter until they were "patched" as Bandidos, points to the acrimony of the split as the sole reason. According to Campbell, in late 1983, one of his brothers and another Comanchero had called on another member and caught Comanchero president Jock Ross in a compromising position with the members wife. As Sergeant-at-Arms, he ordered Ross to face charges of breaking one of the 10 firm rules the club observed. If found guilty, Ross would have been expelled from the club. Ross failed to appear at the first two scheduled meetings and after arriving at the third, simply announced that the club would be split into two chapters and walked out. Campbell, his four brothers, the three McElwaine brothers, Anthony Snodgrass Spencer (Snoddy), Charles Charlie Sciberras and several others who supported bringing charges against Ross set up a new Comanchero chapter in Birchgrove.