- SeniorAdvice.com
- SeniorBridge
- Seniorcorp
- SeniorLink
- SeniorLiving.org
- Seniorly
- Seniors Helpers
- Seniors Helping Seniors
- Seniors Home Care
- Sentara Health
- Sentara Healthcare
- Sentara Home Care
- Sequoia Capital
- Sequoia Financial Group
- Serendipity Home Health
- Serenity Marketing
- Serve America Together
- Service Employees International Union
- Service Employees International Union 775 Northwest
- Services for Adults Staying in Their Homes