Rel may mean:
Reaction Engines Limited, a British aerospace company based in Oxfordshire, England.
Rel, the category of sets and relations
Rights Expression Language, a machine-processable language used for Digital Rights Management
Rel (DBMS), a database management system
rel, an HTML attribute for indicating a semantic link
REL, a file format generated by Microsoft's M80 and Digital Research's RMAC for CP/M
Recommended Exposure Limit, a recommended limit for occupational exposures published by the National Institute for Occupational Safety and Health
Rel proteins, A family of related proteins (includes NF-κB family members).
Rel (time), a fictional Dalek unit of time measurement roughly equal to one second.
Nickname of Arielle Gold, American world champion snowboarder
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