Lav Mazzura (7 January 1876 – 28 March 1930) was a politician and lawyer born in Zagreb. After studying law in Zagreb and Prague, he became one of leaders of the Croatian Progressive Youth [hr]. He was the editor of the Hrvatski pokret ("Croatian Movement") and the Hrvatska misao ("Croatian Thought") journals. In 1910–1913, Mazzura was a member of the Sabor of the Kingdom of Croatia-Slavonia as a member of the Croat-Serb Coalition led by Frano Supilo and Svetozar Pribičević. He was also a member of the joint Hungarian-Croatian Parliament in Budapest (as Croatia-Slavonia was a part of the Lands of the Crown of Saint Stephen).^[1] In November–December 1918, Mazzura was in command of Zagreb-based forces assigned to the Commission for Public Order and Security of the National Council of Slovenes, Croats and Serbs – a body composed of political representatives of the South Slavs living in Austria-Hungary tasked with achieving independence of South Slavic lands from the empire.^[2] According to testimony of Slavko Kvaternik, Mazzura was involved in unsuccessful negotiations to peacefully resolve a standoff during the 1918 protest in Zagreb.^[3] In 1919, Mazzura was appointed to the post of the prosecutor for the city of Zagreb. He died in Zagreb in 1930.^[1]