Organizations are a fundamental component of society, partly because of the human need to connect around similar interests. Professional associations form in response to individual and societal needs and concerns and, in turn, impact society. Mathematics students, teachers, and researchers may join professional mathematics organizations to feel like a part of the larger mathematics community and make a difference beyond their school or university. There are international associations with worldwide memberships, like the International Mathematical Union (IMU), and associations organized by geographical region. National and regional associations worldwide address many of the same issues as mathematics associations in the United States. These issues include teaching, research, service, and the mathematics profession.