Zvonimir Richtmann (22 November 1901 – 9 July 1941) was a Croatian-Jewish physicist, philosopher, politician and publicist who was killed during World War II by Ustaše.

His article "Upheaval in the scientific picture of the world" was published in the first issue of Miroslav Krleža magazine "Seal".

In 1939, Josip Broz Tito attacked Richtmann in the magazin "Proletarian" with the article "Trotskyism and it's helpers".

[1][2][3] In April 1941, after the establishment of the Independent State of Croatia, Richtmann was arrested and imprisoned at Savska cesta prison.

[citation needed] On 9 July 1941 Richtmann was killed by Ustaše together with Božidar Adžija, Otokar Keršovani, Ognjen Prica and Viktor Rosenzweig.