Leo Vroman (April 10, 1915 – February 22, 2014) was a Dutch-American hematologist, a prolific poet mainly in Dutch and an illustrator.

When the Nazis occupied the Netherlands on May 10, 1940, he fled to London, and from there he traveled to the Dutch East Indies.

His uncle was the physician and medical researcher Isidore Snapper, who worked in New York City after emigrating from the Netherlands.

[2] Dr. Vroman's list of accomplishments include winning nearly every Dutch literary award for poetry; having illustrations and drawings that hang in Dutch museums; a scientific output that includes 69 research papers, many of them published in Elsevier journals; and a discovery named after him: the Vroman Effect.

While at Mount Sinai, he conducted research that enabled him to receive his PhD in physiology from Utrecht University.