Encyclopedias, Almanacs, Transcripts, and Maps
- Stirling, Robert (1790–1878)
- Stochastic Change
- Stomatopoda (Mantis Shrimps)
- Stomiiformes (Dragonfishes and Relatives)
- stonechat
- Stones
- Storage and Transport of Hazardous Material
- Storks (Ciconiidae)
- Storm King Mountain
- Storm Runoff
- Storm Sewer
- Storm-Petrels (Hydrobatidae)
- Storms
- Strategic Lawsuits against Public Participation
- Strategic Minerals
- Strategies for Sustainable Water Development
- Stream Channelization
- Stream Systems
- Stream Water Flow
- Strepsiptera (Strepsipterans)