This article presents the development of Polish psychology from the perspective of the most important intellectual formation in Poland—the Lvov‐Warsaw School of Kazimierz Twardowski. The representatives of the school played an extraordinary role in the history of Polish psychology in the first half of the 20th century. Unfortunately, this influence was halted by the outbreak of the war in 1939 and by communist oppression and propaganda after the war. After 1989, Polish psychology underwent a deep transformation in the spirit of Western psychology but with no continuation of the most significant achievements of Twardowski's School. Although this process has integrated Polish psychologists into the mainstream of psychology in the world, it has not led to the integration of one of the most original European psychological traditions into world psychology.