Ėrnest Lʹvovich Radlov

Ernest Leopoldovich Radlov or Ernst Radlow (Russian: Эрнест Леопольдович Радлов, 1854–1928) was a Russian neo-Kantian philosopher and historian of philosophy of German origin. Co-founder of the St. Petersburg Philosophical Society, director of the Public Library in Petrograd (1918–1924).

He was also a friend and editor of Vladimir Solovyov.

Radlov introduced Thomas Masaryk to Russian philosophy in conversations over the summer of 1882.