There is a certain circumstance, which has not been taken into consideration in studies on the Lvov-Warsaw School so far, but which could change the understanding of this phenomenon. One forgets about the fact that Lvov, during existence of Twardowski's school in it (1895–1939), was a multinational and multicultural city – back then it was the biggest centre for Ukrainian culture and science. As a consequence, it is necessary to answer the following questions: Did a widely known Ukrainian cultural and scientific group in Lvov and Eastern Galicia have any impact on forming the Lvov pillar of the School, and the other way round – did the School leave a distinctive impression in the development of the Ukrainian culture and science? Although these questions seem to be reasonable, as yet they have not been considered by historians of science and philosophy. In the given paper I will attempt to fill this gap.