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(Polish title: Polsko-litewskie badania konfrontatywne Zespolu Semantyki Instytutu Slawistyki Polskiej Akademii Nauk). The dissertation discusses the research area of the Lithuanian-Polish theoretical contrastive studies, conducted by the Department of ISS PAS, including.: [1] Lithuanian-Polish theoretical contrastive studies utilizing the interlanguage (Lithuanian-Polish contrastive grammar), [2] Terminological dictionary (definitions of the interlanguage particular sections used in the linguistic contrast along with terminology suggestion for Slavic languages, including Lithuanian), [3] Corpus linguistics and on-line dictionaries (experimental trilingual Bulgarian-Polish-Lithuanian parallel and comparable corpora, experimental corpus of the Lithuanian local dialect of Punsk and experimental electronic Polish-Lithuanian dictionary), [4] Research on the Lithuanian local dialect of Punsk in Poland (grammatical description of the local dialect on the basis of the experimental dialectal corpus in contrast with Polish and Lithuanian).