Snuq - Spok
- Snuqualmie
- SNVCC
- Snyder, Gary
- So Cal
- soak the rich
- soap
- Soap Box Derby
- soap opera
- Soap Opera Digest
- soapbox racing
- sob sister
- sob story
- SOC
- Social Gospel movement
- Social Register
- social security
- Social Security Act
- Social Security Administration
- Social Security Card
- social security number
- social security tax
- social services
- Social Settlement
- social work
- social worker
- Social-Democratic Party
- Socialist Labor Party of North America
- Socialist Party
- Socialist Party of New York and Vicinity
- Socialist Trade and Labor Alliance
- Socialist Workers' Party
- Society for the Preservation and Encouragement of Barber Shop Quartet Singing in America
- Society for the Prevention of Cruelty to Animals
- Society of Friends
- Society of Tammany
- Society of the Cincinnati
- sod house
- soda cracker
- soda fountain
- soda jerk
