Sigma Gamma Rho Sorority, Inc. was founded on November 12, 1922, at Butler University in Indianapolis, Indiana, by seven African American schoolteachers. It became the only Black Greek-letter sorority established at a predominantly white institution during the era of segregation.

The sorority is committed to sisterhood, scholarship, and service, and has grown into a global organization with chapters across the U.S., Africa, and the Caribbean. Sigma Gamma Rho has long been a leader in promoting education, public health, and civil rights within the Black community.

Founders: Mary Lou Allison Gardner Little, Dorothy Hanley Whiteside, Vivian White Marbury, Nannie Mae Gahn Johnson, Hattie Mae Annette Dulin Redford, Bessie Mae Downey Rhoades Martin, and Cubena McClure.