- Solid Waste
- Solidarity
- Solitaire
- Solmization
- Solomon Van Rensselaer
- Solomon's Seal
- Solutions for the Plight of the Middle Class
- Solving Canada's Economic Woes
- Solving the World's Poverty Crisis
- Somalia Affair
- Somalia Affair: Chronology
- Somalia Inquiry's Damning Report
- Sombra Township Treaty (No.7)
- Some of These Days
- Some SI-derived Units with Special Names
