Encyclopedias, Almanacs, Transcripts, and Maps
- Sir Robert Hermann Schomburgk
- Sir Robert John Le Mesurier McClure
- Sir Roger Penrose
- Sir Thomas Button
- Sir Vivian Ernest Fuchs
- Sir Walter Raleigh
- Sir Wilfred Patrick Thesiger
- Sir Willans Owen Richardson
- Sir William Bowman
- Sir William George Armstrong
- Sir William Hamilton
- Sir William Henry Bragg & Sir William Lawrence Bragg
- Sir William Petty
- Siracusa, Vittorio
- Sirenomelia
- Sirens and Dwarf Sirens: Sirenidae
- Sisters of the Amber
- Sitchin, Zecharia
- Sivananda, Swami (1887-1963)
- Six Day Body Makeover