Rems or REMS may refer to:
- Radiofrequency Echographic Multi Spectrometry
- Rams (card game), a card game also known as Rems
- Rapid eye movement sleep, a sleep phase
- Rems (river), a river in Germany
- Research, Evaluation, Measurement, and Statistics, a concentration in Educational Psychology at Texas Tech University
- No. 204 Reserve Equipment Maintenance Satellite at RCAF Station Assiniboia
- Risk Evaluation and Mitigation Strategies, risk management plans to ensure safe use of dangerous pharmaceuticals
- Romanian Electron Microscopy Society, a member society of the European Microscopy Society and consequently the International Federation of Societies for Microscopy.
- Rover Environmental Monitoring Station, meteorological sensors on the Mars rover Curiosity
- Ryan Rems, a Filipino comedian and television personality
- Rems Umeasiegbu, a Nigerian professor, scholar, novelist, poet and folklorist
- Tadej Rems, a Slovenian football player