The 24 cm houfnice vz.39 (German designation: 24 cm Haubitze 39) (Howitzer model 39) was a Czechoslovak-designed siege howitzer used in the Second World War. It was kept in production after the German occupation of Czechoslovakia in March 1939 and a total of eighteen was delivered to the Germans. It was only used by the Army's Artillery Regiment 814 once it entered service shortly before the Battle of France in 1940. The regiment participated Operation Barbarossa and in the Sieges of Sevastopol and Leningrad.