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- Rollers (Coraciidae)
- Rolston, Holmes (1932 – ) American Environmental and Religious Philosopher
- Roman Religion
- Roman Religion: The Early Period
- Roman Religion: The Imperial Period
- Ronsard, Pierre (1524 – 1585) French Naturalist and Poet
- Roosevelt, Theodore (1858 – 1919) American Politician and Conservationist
- Rorquals (Balaenopteridae)
- Ross Dependency
- Roszak, Theodore (1933 – ) American Social Critic
- Rothschild, Meyer Amschel
- Rotifera (Rotifers)
- Round-the-World Weather
- roundworm
- Rousseau, Jean-Jacques
- Roy, Ram Mohan
- RSPCA
- Rubik, Ernö
- Ruckleshaus, William Doyle (1934 – ) American Former Environmental Protection Agency Administrator
