Zygmunt Stanisà Âaw Marek (born March 19, 1872, in Kraków, died 8 November 1931 in Kraków) was a Polish socialist politician.
After graduating from gymnasium he studied law. He joined the Polish Social Democratic Party of Galicia (PPSD) in 1890. Marek was a chief editor of the newspaper WiÃÂzien polityczny (Political prisoner) and Naprzód (Forward) during World War I. In 1919, after Poland regained independence after years of partitions, he joined the united Polish Socialist Party (PPS).
Elected Sejm member the same year, he became chairman of the PPS caucus, replacing Norbert Barlicki in 1926. On May 31, 1926, he nominated Józef Pià Âsudski for President. Pià Âsudski was elected by National Assembly for this post, but decided against taking office. As a result, PPS drafted their own candidate in next election, held on June 1, and Marek became a nominee. He faced Pià Âsudski-backed chemistry professor Ignacy Moà Âcicki and Poznaà  Voivode Adolf Bnià Âski, who represented the right wing. In the first round he placed last with 56 votes (against 215 for Moà Âcicki and 211 for Bnià Âski). In the runoff he finished last again, with just one vote (Moà Âcicki defeated Bnià Âski 281 to 200).
Marek served as a Sejm Vice-Marshal from 1928 to 1931. He was the father of Krystyna Marek, Polish-Swiss professor of public international law.