Organizers
- South Plains College
- South Plains Girls Fastpitch Softball
- South Portland Parks, Recreation and Public Works
- South Region, Texas Bass Federation Nation
- South Riverdale Little League
- South Salem Little League
- South Shore 5K4Q Run and 1-Mile Fun Run
- South Shore Race Management
- South Shore Sailing School
- South Shore School of Theatre
- South Shore Summer Adventures by The Trustees of Reservations
- South Shore Surf Lacrosse
- South Shore Trail Series
- South Shore TRI Coach
- South Shore YMCA
- South Sound Summer Slam
- South Suburban Golf Course
- South Suburban Pop Warner
- South Suburban Tennis Academy
- South Texas Community Tennis Association
- South Texas Health System
- South Texas Juvenile Diabetes Association
- South Tipperary Sports Partnership
- South Towns Tennis Club
- South Whidbey Parks & Recreation District / Whidbey Island Triathlon
- South Windsor Parks & Recreation Department
- South Wood County Humane Society
- South Wood County YMCA
- Southampton Little League
- Southampton Sailing Week
- Southeast Alabama Community Foundation
- Southeast Alaska Independent Living
- Southeast Bulloch High Cross Country
- Southeast Family YMCA
- Southeast Georgia Health System
- Southeast Healthpoint Fitness
- Southeast Little League
- Southeast Nashville Homeschool Enrichment
- SOUTHEAST SOCCER CLUB
- Southeast Tennis and Learning Center
- Southeast Texas Hoops
- Southeast Umpire Camps
- Southeastern Cal Ripken
- Southeastern Cancer Care
- Southeastern Greyhound Adoption
- Southeastern LA FCA
- Southeastern Livingston County Recreation Authority (SELCRA)
- Southeastern Ohio Trail Runners
- Southeastern Regional Action Council
- Southeastern Summer Theatre Institute
