Theodor von Frimmel, fully Theodor von Frimmel-Traisenau was an Austrian art historian, musicologist and Beethoven biographer. He was born in Amstetten and eventually settled in Vienna. Theodor von Frimmel was assistant curator at the Imperial Natural History Museum (Hofmuseum) of Vienna until 1893, later taught art history at the Vienna Athenäum and was director of a gallery. He is mainly remember as musicologist for essays on Beethoven's work, life and images.