Theodosius Rostocki (born as Tadeusz Teodozy Bołbas-Rostocki; Polish: Teodozy Rostocki; 1725 – 25 January 1805) was a bishop of the Ruthenian Uniate Church, Metropolitan bishop of Kiev, Galicia and all Ruthenia. He became the first unite bishop who was a member of the Polish Senate. On 19 June 1785 Rostocki was ordained by Primate of the Uniate Church Jason Smogorzewski along with bishops Cyprian Stecki and John Kaczkowski as a bishop of Chelm. Earlier that year he also was confirmed as a coadjutor Metropolitan bishop of Kiev, Galicia and all Ruthenia.