Theodor Zasche was an Austrian painter and caricaturist.

Zasche was the son of the painter Josef Zasche (1821 in Gablonz - 1881 in Leipzig). He initially learned from his father and later studied at the Vienna School of Applied Arts with Ferdinand Laufberger and Julius Victor Berger. After his father's death, he continued his workshop for porcelain painting and also tried pastel painting.

Zasche worked as an illustrator for numerous magazines in Vienna (Der Floh , Wiener Witzblatt and Wiener Luft , for which he worked after the death of Hans Schliessmann in 1920), Berlin ( Funny Leaves) and Munich ( Flying Leaves ).

From March 24, 1892 he was a member of the Vienna Künstlerhaus.