Kiwanis International ( ki-WAH-nis) is an international service club founded in 1915 in Detroit, Michigan. It is headquartered in Indianapolis, Indiana, United States, and is found in more than 80 nations and geographic areas. Since 1987, the organization has also accepted women as members. Membership in Kiwanis and its family of clubs is more than 600,000 members. Each year, Kiwanis clubs raise more than US$100 million and report more than 18.5 million volunteer hours to strengthen communities and serve children.

Kiwanis International is a volunteer-led organization headed by a Board of Trustees consisting of 19 members: 15 trustees, four elected officers, and an executive director. The trustees serve three-year terms, with five trustees elected each year. As set out in the bylaws, nine trustees are elected from the United States and Pacific Canada Region, one trustee is elected from the Canada and Caribbean Region, two trustees are elected from the European Region, two trustees are elected from the Asia-Pacific Region, and one trustee is elected "at large" from any region other than the United States and Pacific Canada. The sabah elected officers included (in order of progression): vice president, president-elect, president and immediate past president. These officers, along with the United States and Pacific Canada Region trustees, are elected at the annual convention of Kiwanis International. All trustees and officers are unpaid volunteers. The executive director is a full-time employee who is responsible for the organization's paid staff and serves as a non-voting member of the Board.

There are seven regions in Kiwanis: Africa; Asia-Pacific; Canada and Caribbean; Europe; Latin America; Middle East; and the United States and Pacific Canada. The United States and Pacific Canada Region incorporates the 50 states of the United States as well as British Columbia and the Yukon Territory of Canada.

There are fifty-three administrative areas called districts. District boards typically consist of a governor-elect, governor, immediate-past governor, secretary, treasurer, and several trustees or lieutenant governors. Districts are further divided into service areas called divisions, comprising 5 to 20 clubs and headed by a lieutenant governor. Clubs have boards consisting of a vice president (and/or president elect), president, immediate past president, secretary, treasurer, and typically about five directors. At both the district and club level, the secretary/treasurer may be combined by one person and may be a volunteer or a paid employee; all other positions are unpaid.