Leon Zaleski (c. 1810 in Poland–February 1841 in Lwów) was a Polish patriotic activist.
Zaleski was a member of the Towarzystwo Demokratyczne Polskie, co-organiser of Józef Zaliwski guerrilla warfare (1833), co-founder of the Stowarzyszenie Ludu Polskiego (1835) and member of its Zbór Główny, co-founder of the Konfederacja Powszechna Narodu Polskiego (1837).
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