Bernard Heuvelmans (10 October 1916 – 22 August 2001) was a Belgian-French scientist, explorer, researcher, and writer probably best known, along with Scottish-American biologist Ivan T. Sanderson, as a founding figure in the pseudoscience and subculture of cryptozoology.

[2] His 1958 book On the Track of Unknown Animals (originally published in French in 1955 as Sur la Piste des Bêtes Ignorées) is often regarded as one of the most influential cryptozoology texts.

During World War II he had escaped from a Nazi prison camp and later worked as a jazz singer in Paris.

[6] Science writer David Quammen has stated that Heuvelmans's On the Track of Unknown Animals is "heavily researched and encyclopedic" but contains "leaps of credulity that leave a skeptical reader behind."

Biologist Aaron Bauer noted that "Heuvelmans's own writings, this book included, often eschew critical analysis of available data".