- Reed Smith
- Reed Smith L.L.P.
- Reedley Community College
- ReedSmith LLP
- Reef
- REES Associates Inc.
- Reese Lower Patrick and Scott Architects
- Reeves Memorial Medical Center
- RegalCare
- Regen Enterprises, LLC
- Regence Bluecross Blueshield
- Regency Hospital Northwest
- Regency Hospital of Central Georgia
- Regency Hospital of Meridian
- Regency Suites Hotel
- Regeneration Technologies, Inc.
- Regenerative Biologics Inc, formerly Southeast Tissue Alliance
- Reginald's Safe Haven Corp
- Region 9 Development Commission
- Region VI, CMS, DHHS
- Region VI, Office for Civil Rights, HHS
- Regional Allergy and Asthma Consultants, PA
- Regional Council of Rural Counties
- Regional Director's Office, VI, HHS
- Regional Emergency Medical Services Authority (REMSA)
- Regional Health Rapid City Hospital
- Regional Health Services of Howard County
- Regional Health Spearfish Hospital
- Regional Medical Center
- Regional Medical Center
- Regional Medical Center Anniston Northeast AL
- Regional Medical Center Bayonet Point
- Regional Medical Center Blytheville
- Regional Medical Center of Central Alabama
- Regional Medical Center of San Jose
- Regional One Health Medical Center
- Regional Organ Bank of Illinois
- Regional Rehabilitation Hospital
- Regional Women's Health Office
- Regions Hospital
- Regis College
- Regulatory Affairs Professionals Society
- Rehab Management, Inc
- Rehab Partners
- RehabCare Group
- REHABWORKS
- Rehrig Pacific Co.
- Reid Health
- Reigel Plumbing and Heating
- Reingold