Rotary International is one of the largest service organizations in the world. The mission of Rotary, as stated on its website, is to "provide service to others, promote integrity, and advance world understanding, goodwill, and peace through [the] fellowship of business, professional, and community leaders". It is a non-political and non-religious organization. Membership is by application or invitation and based on various social factors. There are over 46,000 member clubs worldwide, with a membership of 1.4 million individuals, known as Rotary members.

Paul Percy Harris was a Chicago, Illinois, attorney. He founded the club that became the humanitarian organisation Rotary International in 1905.