{Sigma Xi; L. Silberstein; Edward E. Simonds; Frederick Simpich; Arthur W. Sinclair; A. de Sitter; W. T. Skilling; Sarah Louise Slaughenhaup; Paul Slavenas; Frederick Slocum; E. E. Slosson}
Science and Invention (2); Science Service (3); Sigma Xi (4); W. T. Skilling (6); Southern California Edison Co. (1); Olenus Lee Sponsler (3); Joel Stebbins (1); The Stupakoff Laboratories (1); Goodwin Deloss Swezey (1)
{Salto Observatory; Sanborn, Vail & Co.; San Diego Business and Professional Women's Club; San Diego County Planning Commission; San Diego Scientific Library; E. Sanger-Sheppherd; W. W. Sargeant; A. P. Saunders; Frederick A. Saunders; George G. Saunders}
{W. M. Smart; Albert M. Smith; Ruth Emily Smith; Sinclair Smith; Smith Premier Typewriter Co.; Smithsonian Institution; Edwin R. Snyder; Sociedad Astronómica de España y América; Società Astronomica Italiana; Société Astronomique de France; Société Francaise de Physique; Society of Writers to H. M. Signet}
{Karl Schwarzschild; Arthur Searle; Frederick Slocum; Southern California Academy of Sciences [Holdridge O. Collins]; Ormond Stone; Tiffany & Co.; University Club of Pasadena [R. I. Howe; Esward L. Mayberry]; Felipe Valle; J. Violle; E. Warburg; A. B. Wills; A. Wolfer; E. Wiedemann}
{Science Press; Science Progress; Scientia; Scientific American; Scientific International Research Service Corp.; E. M. Scofield; Charles Scribner's Sons; N. P. Scudder; H. von Seeliger; Seismological Society of America; Selznick International Pictures, Inc. [W. E. McCune]; Service; Geneva Seybold; James A. Shanahan; W. N. Shaw; Barbara Sheffield}
{Leo J. Scanlon; William C. Scarritt; Robert O. Schad; Paul W. Schenck; James A. B. Scherer; Frank H. Schleer; Carl Schleicher & Schüll; Hans W. Schneider; Dorothy E. Schoof; J. Schroeter; F. Schuerer; L. Schützenberger; A. Schwassmann}
