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- Safari Books Online
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- Samuel Johnson's Dictionary
- See: Eighteenth Century Collections Online
- SCAD
- See: Europa
- Science Careers
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- Science Citation Index
- See: Web of Knowledge
- Science Direct
- Elsevier
- Science Direct ebooks
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- Science's Next Wave
- See: Science Careers
- Scientific.Net - Materials Science and Engineering
- Scientific.Net
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- Chemical Abstracts
- SCIPIO: Art and Rare Book Sales Catalogs
- See: FirstSearch
- Scirus
- Elsevier
- Scopus
- Elsevier
- screenonline
- British Film Institute
- SDC Platinum
- Thomson Financial
- SEMDOC
- Statewatch
- Seventeenth and Eighteenth Century Burney Collection
- See: 17th and 18th Century Burney Collection
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- Society for Industrial and Applied Mathematics
- Slavery, Abolition and Social Justice
- Adam Matthew Digital
- Social Care Online
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- Ovid Online
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- See: Universal Database of Social Sciences and Humanities
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- See: Web of Knowledge
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- ProQuest
- Social Work Toolkit
- Palgrave Macmillan
- Society of Petroleum Engineers
- See: OnePetro
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- ProQuest
- Sociology: A Sage Full-Text Collection
- See: Sage Full-Text Collections
- Specify-It
- See: Info4Education
- SPIE Digital Library
- International Society for Optical Engineering
- SPORTDiscus
- EBSCO
- Springer ebook Collection
- Springer
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- SpringerMaterials
- See: Landolt-Börnstein
- SpringerProtocols
- Springer
- Stanford Encyclopedia of Philosophy
- Stanford University
- Stat!Ref
- Thompson Henry
- State Trials
- See: Justis
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- Statewatch
- Stedman's Medical Dictionary
- See: Stat!Ref
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- MedicinesComplete
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