Josef Johann Mann (19 May 1804 – 20 March 1889), or Johann Josef Ritter von Mann, was a German Bohemian entomologist and a specialist in Lepidoptera.
Mann was born in Jablonné v Podještedí, Bohemia (present-day Czech Republic).
He was a painter, expedition collector and preparator at the Hofkabinet in Vienna, Austria.
Mann worked with the curator Alois Friedrich Rogenhofer.