Mount Rittmann is a volcano in Antarctica. Discovered in 1988-1989 by an Italian expedition, it was named after the volcanologist Alfred Rittmann (1893-1980). It features a or wide caldera which crops out from underneath the Aviator Glacier. The volcano was active during the Pliocene and into the Holocene; a major eruption occurred in 1254 CE and deposited tephra over much of Antarctica. Currently, the volcano is classified as dormant.