The Junior League of Cobb-Marietta is a nonprofit organization of about 400 women dedicated to promoting volunteerism, developing the potential of women and improving its community. The group formed in 1933 as the Marietta Junior Welfare League and adopted its current name in 1976.

The Junior League has founded and supported many community projects across Cobb County including the Creswell School, the Cobb County Youth Museum, the Center for Children and Young Adults, Gate City Nursery and Sheltering Arms Daycare. The group conducts several fund-raisers each year to support its projects.

The Junior League maintains its local headquarters at the Marietta Garden Center.