Index R
- Race
- Rachels, James
- Radial velocity
- Radio astronomy
- Radioactive decay see Radiometric dating
- Radiocarbon dating
- Radiohalos see Polonium halos
- Radiometric dating
- Rain
- Random genetic drift
- RATE (Radioisotopes and the Age of the Earth)
- Reasons to Believe (RTB)
- Reciprocal altruism
- Redshift
- Rees, Sir Martin
- Relativity
- Religion
- Replacement theory
- Reproduction
- Reproductive isolation
- Reptiles
- Repulsive force see Antigravity
- Rhesus macaques
- RNA
- Robertson, Pat
- Rocks, oldest
- Roman Catholic Church
- Romance languages
- Romania
- Ross, Hugh
- Rothschild, Eric
- Ruse, Michael
- Russell, Bertrand
- Ryland, Mark