Sigma Pi Phi (ΣΠΦ), also known as The Boulé, is an African American professional fraternity.

Founded in Philadelphia, Pennsylvania, in 1904, it is the oldest Greek lettered fraternity for African Americans.

[3] Sigma Pi Phi quickly established chapters (referred to as "member boulés"[A]) in Chicago, Illinois and then Baltimore, Maryland.

[9] Founded as an organization for professionals, Sigma Pi Phi never established collegiate chapters and eliminated undergraduate membership during its infant stages.

[12] Lawrence Otis Graham reports on the organization and his membership in it in the 1999 book Our Kind of People: Inside America's Black Upper Class.