Rabanus, Maurus Magnentius/Hraban Maur (776-856)

Ramsey, Frank Plumpton (1903-1930)

Reid, Thomas (1710-1796)

Rhazes/Rasis/Al-Razi (865-925)

Ricardo, David (1772-1823)

Ripa, Cesare (ca. 1555/60-1622)

Roscellinus Compendiensis/Roscelin de Compiègne (1050-1122)

Rosmini Serbati, Antonio (1797-1855)

Rousseau, Jean-Jacques (1712-1788)

Russell, Bertrand (1872-1970)

Russell, Bertrand (1872-1970)-Whitehead, Alfred North (1861-1947)