Povilas Brazdžiūnas (born 18.09.1897) was a Soviet physicist and academician of the Academy of Sciences of the Lithuanian SSR (1956). He was born in Žižmariškis. He graduated from the universities of Kaunas (1925) and Zurich (1930). In 1930-40 he worked at Kaunas University and in 1940 — 70 at Vilnius University (professor from 1945).
His research concerned electron optics and semiconductor physics (a study of the electrical, photoelectric and optical properties of thin semiconductor layers). He studied the Stark effect of the resonance line of mercury in crossed electric and magnetic fields.