Leon Biegeleisen (1885-1944) was a Polish economist and academic teacher and an officer of the Polish Army. He studied in Berlin, Vienna and Lviv. During World War I, he collaborated with the Supreme National Committee (Naczelny Komitet Narodowy). After the war, he delivered lectures on economic policy and economics at the Free Polish University (Wolna Wszechnica Polska). He did not survive the Second World War, nevertheless the date and circumstances of his death are unclear. Among Biegeleisen’s major achievements, the following works are worth mentioning: Teoria małej i wielkiej własności [Theory of Small and Large Property], Polityka gospodarcza Italii [Economic Policy of Italy], Polityka gospodarczo-aprowizacyjna miast polskich [Economic and Supply Policy of Polish Cities] and the two-volume Wstęp do nauki ekonomii społecznej [Introduction to the Science of Social Economics].