- Southern Hills Hospital and Medical Center
- Southern Historica Associan
- Southern Illinois Healthcare Foundation, Inc.
- Southern Illinois University
- Southern Illinois University School of Medicine
- Southern Iowa Oil
- Southern Maine Medical Center - Biddeford
- Southern Maine Medical Center - Sanford
- Southern Maryland Hospital Center
- Southern Medical Center
- Southern New Hampshire Medical Center
- Southern Ocean Medical Center
- Southern Ohio Medical Center
- Southern Regional Medical Center
- Southern Tennessee Regional Health System - Winchester
- Southern University and AandM College, School of Nursing
- Southern Utah University
- Southern Virginia Regional Med Center
- Southern Virginia Regional Medical Center
- Southern Wesleyan University
- Southhaven Chamber of Commerce
- Southside Community Hospital - Centra
- Southside Hospital
- Southside Regional Medical Center
- Southview Medical Center
- Southwell Medical
- Southwest Airlines
- Southwest Airlines
- Southwest Cable Communications Association
- Southwest Community Health Center
- Southwest Florida Regional Medical Center
- Southwest Florida Regional Medical Center Transplant Program
- Southwest Gas
- Southwest Louisiana Primary Health Care Center, Inc.
- Southwest Mississippi Regional Medical Center
- Southwest Transplant Alliance
- Southwest Valley YMCA
- Southwestern District Health Unit
- Southwestern Eye Center
- Southwestern Medical Center
- Southwestern Pennsylvania Human Services Inc.
- Southwesterns Pennsylvania Corp.
- SOVAH Health Danville
- Sovah Health Martinsville
- SP Recycling
- Space Center Houston Rotary
- Space Coast Office of Tourism
- Space Imaging
- Space Tables
- Spalding University