E. O. Plauen (often stylized as e.o.plauen) was the pseudonym of Erich Ohser (18 March 1903 – 5 April 1944) (some sources give his birth year as 1909), a German cartoonist best known for his strip Vater und Sohn ("Father and Son").

In his work for such democratic magazines as Vorwärts, satirical representations of Joseph Goebbels and Adolf Hitler earned him the enmity of the Nazis, and he was prohibited from practicing his trade (Berufsverbot).

E.O.Plauen also did the black and white illustrations in the satirical poetry books 'Herz auf Taille' and 'Ein Mann gibt Auskunft' by Erich Kästner (Atrium Verlag Zuerich).

Vater und Sohn was a generally wordless feature consisting typically of five or six panels, in which a stout, bald man with a moustache and his young son Eric get into and out of various predicaments regarding day-to-day events.

In the early 1990s, the feature was also transformed into a children's book series by Iranian publisher, 'Vazheh', which included explanations of the cartoons (in Persian) along with the strip on the opposite page.