R
- Rabi oscillations – Isidor Isaac Rabi
- Rademacher distribution, function, series, sum – Hans Adolph Rademacher
- Rademacher–Kolmogorov theorem – Hans Adolph Rademacher and Andrey Nikolaevich Kolmogorov
- Rademacher–Menchov theorem – Hans Adolph Rademacher and ? Menchov
- Raman scattering – Chandrasekhara Venkata Raman
- Ramsauer–Townsend effect (a.k.a. Ramsauer effect, Townsend effect) – Carl Ramsauer and John Sealy Townsend
- Ramsden circle/disc/eyepoint, eyepiece – Jesse Ramsden
- Ramsey spectroscopy – Norman F. Ramsey
- Ramsey theory – Frank Plumpton Ramsey
- Ramsey–DeFinetti theorem – Frank Plumpton Ramsey and Bruno de Finetti
- Rapoport's rule – Eduardo H. Rapoport
- Raychaudhuri's equation – Amal Kumar Raychaudhuri (অমল কুমার রায়চৌধুরী)
- Raygor Estimate Graph – Alton L. Raygor
- Rayleigh criterion, distribution, fading, number, quotient, scattering, waves – Lord Rayleigh
- Rayleigh–Bénard cell/convection – Lord Rayleigh and Henri Bénard
- Rayleigh–Jeans law – Lord Rayleigh and Sir James Jeans
- Rees–Sciama effect – Martin Rees and Dennis Sciama
- Reidemeister moves – Kurt Reidemeister
- Rescorla–Wagner rule – Robert A. Rescorla and Allan R. Wagner
- Reynolds number, Reynolds analogy – Osborne Reynolds
- Ribot's law (of Retrograde Amnesia) – Théodule Ribot
- Ricardian equivalence – see Barro-Ricardo equivalence, above
- Richards controller – Charles L. Richards
- Richardson's constant, equation, law – Owen Willans Richardson
- Richardson number – Lewis Fry Richardson
- Richter magnitude scale – Charles Francis Richter
- Righi–Leduc effect (a.k.a. Leduc–Righi effect) – Augusto Righi and S. Leduc
- Ringelmann effect – Max Ringelmann
- Robertson–Walker metric (a.k.a. Friedmann–Robertson–Walker metric) – see Friedmann–Lemaître–Robertson–Walker metric, above
- Roche limit – Édouard Roche
- Roche sphere (a.k.a. Hill sphere) – Édouard Roche (and George William Hill)
- Rollin film – Bernard V. Rollin
- Rosenthal effect (a.k.a. Pygmalion effect, Observer-expectancy effect) – Robert Rosenthal (and Pygmalion)
- Rossby waves – Carl-Gustaf Arvid Rossby
- Rossi–Forel scale – Michele Stefano Conte de Rossi and François-Alphonse Forel
- Rössler equation – Otto Rössler
- Rossmann fold – Michael Rossmann
- Royer oscillator (a.k.a. Buck oscillator) – George H. Royer
- Ruelle operator, zeta function – David Ruelle
- Ruelle–Perron–Frobenius theorem – David Ruelle, Oskar Perron, and Ferdinand Georg Frobenius
- Ruhmkorff coil – Heinrich D. Ruhmkorff
- Runge–Lenz vector – see Laplace–Runge–Lenz vector
- Runge's phenomenon – Carle David Tolmé Runge
- Russell's paradox – Bertrand Russell
- Rutherford experiment (a.k.a. Geiger-Marsden experiment), scattering – Ernest Rutherford
- Rybczynski theorem – Tadeusz Rybczynski
- Rydberg constant, formula – Johannes Rydberg
- Rydberg–Klein–Rees method – Johannes Rydberg, Oskar Klein, and Albert Lloyd George Rees
Read more about this topic: Scientific Phenomena Named After People