Zygmunt Witalis Zaremba (born 1895, Piotrków, Poland – died 5 October 1967, Sceaux, France), pseudonyms Andrzej Czarski (Czerski), Wit Smrek, was a Polish socialist activist and publicist.
Zaremba was a member of the Youth Association for Progress and Independence (Związek Młodzieży Postępowo-Niepodległościowej; 1911), Polish Socialist Party - Opposition (Polska Partia Socjalistyczna - Opozycja; 1912–1914), then was a member of the Polish Socialist Party (Polska Partia Socjalistyczna) and its Central Executive Committee (Centralny Komitet Wykonawczy; 1917–1918).
From 1918 onward, he stayed in Poland. Then, he became a member of Polish Socialist Party authorities – Supreme Council (Rada Naczelna; 1919–1939) and Central Executive Committee (1921–1924, 1926–1939). During the years of 1921–1924 he was a vice-president of its Supreme Council.
From 1922–35, he was a deputy in the Sejm. During the invasion of Poland in 1939, he organised the Robotnicza Brygada Obrony Warszawy.[clarification needed] Zaremba was a co-founder of conspiratory Polish Socialist Party - Freedom-Equality-Independence (PPS - Wolność-Równość-Niepodległość).
From 1944–45, he was a representative of the Council of National Unity (Rada Jedności Narodowej). In 1946, he moved to Paris, where he became a president of the Central Committee (Rada Centralna) of the Polish Socialist Party. In 1949, he co-founded Political Council (Rada Polityczna) in London. He was a president and co-founder of the International Socialist Office and then, until 1964, president of the Central-East Socialist Europe Union.
Zaremba was a co-author of Program Polski Ludowej (1941). He edited Robotnik, Pobudka, and Związkowiec, as well as the journals Światło (1947–1959) and Droga (1959–1960).
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