RANS or Rans may refer to:
- rANS, an entropy coding technique
- Rans, Jura, a commune in eastern France
- Rans (Penafiel), a parish in the municipality of Penafiel, northern Portugal
- RANS Cilegon F.C., an Indonesian football club
- Rans Designs, an aircraft, sail trike, land yacht and bicycle manufacturer, usually styled as "RANS" by the company
- Reynolds-averaged Navier–Stokes equations