Somerville Rotary is part of a worldwide organization of business and professional leaders that provides humanitarian service, encourages high ethical standards in all vocations, and helps build goodwill and peace in the world. Approximately 1.2 million Rotarians belong to more than 31,000 Rotary clubs located in 166 countries. The world's first service organization, Rotary International has a long history of helping those in need. Somerville Rotary provides support to projects that benefit the community through financial support and through club volunteer projects.

The main objective of Rotary is service — in the community, in the workplace, and throughout the world. Rotarians develop community service projects that address many of today's most critical issues, such as children at risk, poverty and hunger, the environment, illiteracy, and violence. They also support programs for youth, educational opportunities and international exchanges for students, teachers, and other professionals, and vocational and career development. The Rotary motto is Service Above Self.