Bluma Wulfovna Zeigarnik (Russian: Блю́ма Ву́льфовна Зейга́рник; 9 November 1901 – 24 February 1988) was a Soviet psychologist and psychiatrist, a member of Berlin School of experimental psychology and Vygotsky Circle. She discovered the Zeigarnik effect and contributed to the establishment of experimental psychopathology as a separate discipline in the Soviet Union in the after-World War II period.