Sigma Chi (ΣΧ) International Fraternity is one of the largest North American fraternal literary societies. The fraternity has 244 active (undergraduate) chapters and 152 alumni chapters across the United States and Canada and has initiated more than 350,000 members. The fraternity was founded on June 28, 1855, at Miami University in Oxford, Ohio, by members who split from the Delta Kappa Epsilon fraternity.

Sigma Chi is divided into seven operational entities: the Sigma Chi Fraternity, the Sigma Chi Foundation, the Sigma Chi Canadian Foundation, the Risk Management Foundation, Constantine Capital Inc., the Blue and Gold Travel Services, and the newly organised Sigma Chi Leadership Institute.Like all fraternities, Sigma Chi has its own colors, insignia, and rituals. According to the fraternity's constitution, "the purpose of this fraternity shall be to cultivate and maintain the high ideals of friendship, justice, and learning upon which Sigma Chi was founded"