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)
• Red Star Belgrade, Serbian football club (official name "Fudbalski klub Crvena zvezda")
• 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