No, Harley-Davidson owners are not required to be part of a motorcycle club. Joining a club is a personal choice and not mandatory for Harley-Davidson owners or motorcycle enthusiasts in general. Many Harley-Davidson riders do choose to join motorcycle clubs or organizations, as they offer opportunities for socializing, group rides, events, and camaraderie with like-minded riders.
Motorcycle clubs can range from casual groups of friends who ride together to more structured organizations with specific membership requirements and bylaws. Some clubs are centered around a particular interest or affinity, such as Harley Owners Group (H.O.G.), which is a worldwide organization sponsored by Harley-Davidson.
It ultimately depends on your personal preferences and whether you feel that joining a club aligns with your interests and goals as a rider. Many Harley-Davidson owners enjoy the freedom of riding independently or joining informal riding groups without formal club affiliations.