Res
- Bright (American band Bright album)
- Entity (disambiguation)
- Latin phrases
- Object (philosophy)
- RE5 (disambiguation)
- RES (magazine)
- RES - The School for Renewable Energy Science
- Rail Express Systems
- Railway Enthusiasts Society
- Renewable Electricity Standard
- Renewable Energy Systems
- Res (singer)
- Res cogitans
- Res communis
- Res divina
- Res extensa
- Res gestae
- Res inter alios acta
- Res ipsa loquitur
- Res judicata
- Res nullius
- Res publica
- Reservoir railway station
- Residue (complex analysis)
- Resistencia International Airport
- Reticuloendothelial system
- Rez (disambiguation)
- Royal Economic Society
- Royal Entomological Society
- Russian and Eurasian Security Network
- Répertoire d'Épigraphie Sémitique
- Spanish Supercomputing Network
- The Seaside (album)