Franz Joseph Oskar Ernst Patrick Friedrich Leopold Prinz von Preußen (27 August 1895, in Berlin – 27 November 1959, in Lugano) was a German art collector and dealer.

He was the son of Prince Friedrich Leopold of Prussia and Princess Louise Sophie of Schleswig-Holstein-Sonderburg-Augustenburg, and a nephew of German Empress Augusta Victoria, his mother's elder sister.

[2] In 1918, following widely publicized hearings, which reached the Kammergericht (Berlin State Supreme Court), the Ministry agreed to halt its proceedings.

[4] He lived with his private secretary, Friedrich Freiherr Cerrini de Monte Varchi (1895–1985), known as "Pierrot", in the "gentleman's wing" of the Palace.

One of the pieces that Bliss purchased in 1937, a 12th-century Byzantine tondo from the Palace's monastery courtyard, led to a criminal investigation and proceedings at the Potsdam District Court [de], which resulted in heavy fines for the Prince and Cerrini.

In 1945, he was part of a group of high-status prisoners and Sippenhaften (people guilty by kinship), who were transported to South Tyrol by the SS.