Dr. Karlo Weissmann (14 February 1890 – 1953) was a Croatian physician and founder of the first sanatorium in Osijek.
Upon completing specialization he returned to Osijek where he led an anti-tuberculosis dispensary.
[3] Weissmann was a long time member of the Jewish community Osijek.
On 20 April 1926 Weissmann and several others Jewish athletes founded the "Rowing sport club Bar Kohba", which he also presided.
During World War II, as a Jew, he was persecuted and forced to leave Osijek.