Harald Zenz, 25, reportedly went by the name “Harald Hitler” when he introduced himself to people at bars.
The Austrian native parted his hair to the side and grew the distinctive half-moustache associated with Adolf Hitler, prompting authorities to believe he may have idolised the German dictator.
Zenz was also spotted in a local bookstore browsing through World War II magazines.
Zenz was arrested by authorities after he was spotted having his photo taken outside the home Hitler first lived in.
It is illegal to glorify Hitler or the Nazi regime in Austria, as it is in Germany.
In France, waving a flag with a Nazi swastika on it can get you arrested.
“It is definitely not a carnival joke or an art project,” a police spokesman told the BBC. “The young man knows exactly what he is doing,”
Hitler was born in Braunau am Inn, then part of Austria-Hungary, in 1889.
Austria’s Parliament voted in December to buy the three-storey house where the dictator was born, which the Government has rented since 1972 to control how it is used.
Glorifying Hitler or the Nazis is a crime in Austria, which Nazi Germany annexed in 1938.