Lev Shlubych Zalenskyj (Ukrainian: Лев Шлюбич-Заленський, Belarusian: Леў Шлюбіч-Заленскі, Polish: Lew Ślubicz-Załęski) (c. 1648–1708) was the "Metropolitan of Kiev, Galicia and all Ruthenia"[a] in the Ruthenian Uniate Church — a sui juris Eastern Catholic Church in full communion with the Holy See.
He entered at a young age the Order of Saint Basil the Great, and after novitiate he was assigned to the Supraśl Lavra.
Zalenskyj received the appointment from King John III Sobieski on 30 November 1678 and shortly later he was consecrated a bishop by Metropolitan Kyprian Zochovskyj.
When in October 1693 the Metropolitan Kyprian Zochovskyj died without a coadjutor, Zalenskyj was chosen to temporarily lead the Church because he was the Protothronius.
The second part of Zalenskyj's reign was marked by the difficulties of the Great Northern War (started in 1700), and by the persecutions of Peter I of Russia against the Greek Catholic Church, such as the murdering of Basilian monks on 11 July 1705 in Polotsk.