Bernhard Zondek (Hebrew: ברנרד צונדק; 29 July 1891 – 8 November 1966) was a German-born Israeli gynecologist who developed the first reliable pregnancy test in 1928.

He worked under Karl Franz at the university women's clinic in Berlin Charité, where he specialized in obstetrics and gynecology.

His older brother, Hermann Zondek, was a professor at the Humboldt University of Berlin and a pioneer of modern endocrinology.

[1] In 1926, he became ausserordentlicher Professor, and in 1929, chief physician of the obstetrics and gynecology ward at the municipal hospital of Berlin-Spandau.

[2] His work with the gynecologist Selmar Aschheim led to his bioassay for human chorionic gonadotropin, originally using mice, known as the Aschheim-Zondek or A-Z test.