People beginning with R
- Ravitch, Mark Michael
- Ravits, Harold G.
- Rawson, Arthur Joy
- Rayer, Pierre-François-Olive
- Raymond, Fulgence
- Raynaud, A. G. Maurice
- Razdolskii, Ivan Yakovlievich
- Reback, S.
- Rebeitz, J. J.
- Recklinghausen, Friedrich Daniel von
- Reclus, Paul
- Redlich, Emil
- Reed, Dorothy
- Reenstierna, John
- Reese, Algernon B.
- Refsum, Sigvald Bernhard
- Regaud, Claude
- Rehn, Ludwig Wilhelm Carl
- Reichel, Friedrich Paul
- Reichert, A.
- Reid, Robert William
- Reifenstein jun., Edward Conrad
- Reil, Johann Christian
- Reilly, William Anthony
- Reimann, Hobart Ansteth