Bernhard Fischer-Wasels (25 January 1877, in Atsch near Stolberg (Rhineland) – 23 December 1941, in Frankfurt), known as Bernhard Fischer until 1926, was a German physician and anatomical pathologist, who served as Director of the Senckenberg Institute of Pathology (1908–1941), Professor of Pathology (1914–1941) and Rector of the Goethe University Frankfurt (1930–1931).

Bernhard Fischer studied medicine in Strasbourg, Munich and Berlin, and obtained his doctoral degree in Bonn in 1900 and his Habilitation in 1903.

His doctoral advisor was Karl Koester, himself a student of Friedrich Daniel von Recklinghausen and a grand-disciple of the father of modern pathology, Rudolf Virchow.

"[1] His students and long-time collaborators at the Senckenberg Institute of Pathology included Philipp Schwartz, Rudolf Jaffé, Edgar Goldschmid and Gerhard Schmidt, all of whom had to flee the country due to their Jewish backgrounds, partially at the urging and with the help of Fischer-Wasels.

[5] He was a son of glassworks director Heinrich Fischer, and his family belonged to the Old Catholic Church.