RSB

RSB may refer to:


 * Rajapur Saraswat Brahmins, an Indian Brahmin community
 * Rashid School For Boys, Dubai
 * Rebecca Sean Borgstrom, former name of role-playing game author Jenna Moran
 * Revolutionary Socialist League (Germany) (Revolutionär Sozialistischer Bund, RSB)
 * Rigi-Scheidegg-Bahn, a former mountain railway in Switzerland
 * Riverside School Board, Quebec, Canada
 * The reporting mark for the Rochester Subway
 * Roundtable on Sustainable Biofuels
 * Royal Society for the Blind, a not-for-profit organisation servicing blind and visually impaired people in South Australia
 * Royal Society of Biology, a learned society and professional association in the United Kingdom
 * The former Swedish Red Pied or Rödbrokig Svensk Boskap breed of cattle