Ondřej Sekora (25 September 1899, Brno – 4 July 1967, Prague) was a Czech painter, illustrator, writer, journalist and entomologist. He is known mainly as an author of children books. Sekora was also one of the first propagators of rugby in Czechoslovakia.
In 1919 he graduated from the gymnasium in Vyškov. He then studied at the Faculty of Law of Masaryk University. From 1921 he worked as a sports editor, illustrator, reporter and commentator for Lidové noviny newspaper in Brno. In 1923 he married Markéta Kalabusová, but was divorced a year later. From 1929 to 1931 he studied privately as a pupil of Professor Arnošt Hofbauer. In 1927 the editorial office of Lidové noviny moved to Prague.
Sekora married his second wife, Ludmila Roubíčková, in 1931. A year later she bore him a son, who was also named Ondřej. In 1941, during World War II, he was forced to leave his job and expelled from the Federation of Czech Journalists. The reason was his mixed marriage. His second wife, Ludmila, was of Jewish origin, and the whole family was persecuted by Germans as racially mixed. From October 1944 to April 1945, he was imprisoned in the German labor camps in Kleinstein (Poland) and Osterode (Germany). His wife was deported to the Theresienstadt concentration camp. In Osterode, Sekora met and befriended Czech actor Oldřich Nový, with whom he attempted to organize the puppet theatre in the camp. Both Sekora and his wife survived the imprisonment, and he later described his experience in his diary.