Witold Stanisław Kazimierz Bełza was a Polish librarian, writer, publicist and cultural activist. He was the director of the Provincial and Municipal Public Library of Bydgoszcz from 1920 to 1939 and from 1945 to 1952.

The Voivodeship and Municipal Public Library "Dr. Witold Bełza" in Bydgoszcz is housed in historical buildings located between the Stary Rynek and Długa street, registered on the Kuyavian-Pomeranian Voivodeship Heritage List. It is the oldest (1903) library in activity in the Kuyavian-Pomeranian Voivodeship. Since 2002, it bears the name of Witold Bełza.