| Office: | Minister of Foreign Affairs |
| Predecessor: | Wincenty Rzymowski |
| Successor: | Stanisław Skrzeszewski |
| Term Start: | 6 February 1947 |
| Term End: | 20 March 1951 |
| Office1: | Ambassador of Poland to the Soviet Union |
| Predecessor1: | Stefan Jędrychowski |
| Successor1: | Henryk Raabe |
| Term Start1: | 2 January 1945 |
| Term End1: | 28 June 1945 |
| Birth Date: | 15 April 1900 |
| Birth Place: | Częstochowa, Congress Poland, Russian Empire |
| Death Place: | Warsaw, Polish People's Republic |
| Party: | Communist Party of Poland Polish Workers' Party Polish United Workers' Party |
| Alma Mater: | Faculty of Law of the University of Warsaw |
| Nationality: | Polish |
| Profession: | Politician, diplomat, economist, professor, philosopher |
| Zygmunt Modzelewski | |
Zygmunt Modzelewski (15 April 1900, Częstochowa – 18 June 1954, Warsaw) was a Polish communist politician, professor, economist, and diplomat.
He was a member of the Social Democracy of the Kingdom of Poland and Lithuania and Communist Party of Poland. From 1923 to 1937, he was a member of the French Communist Party and even joined its Central Committee. In 1937 he moved to the Soviet Union and was arrested by NKVD in the same year in the Great Purge. Despite torture he refused to give false confession and was released in 1939. Later, he joined the Union of Polish Patriots and the Central Bureau of Polish Communists and became the first director of Polpress, a precursor to the Polish Press Agency. He joined the Polish Workers' Party in 1944 (and later its successor, the Polish United Workers' Party) and eventually became the member of its Central Committee. He was also a member of the Polish Council of State and a deputy to the State National Council and Legislative Sejm. He was also a Polish delegate at the session of the Preparatory Commission of the United Nations. Involved in the work of the Slavic Committee in Poland. From 1947 to 1951 he was the Minister of Foreign Affairs. From 1951, rector of the Institute of Social Sciences of the Central Committee of the Polish United Workers' Party.
He received the Order of the Builders of People's Poland. He was also the adoptive father of Karol Modzelewski.