Avenarius (translated from ) may refer to:
Ferdinand Avenarius (1856–1923), a German poet Georgy Avenarius (1903–1958), one of the founders of Soviet film criticism Johannes Avenarius or Johann Habermann (1516–1590), a theologian Richard Avenarius (1843–1896), a philosopher Vasily Avenarius (1839–1923), a writer and memoirist