Chapman Grant (March 27, 1887 – January 5, 1983) was an American herpetologist, historian, and publisher.
He became the assistant curator of entomology at the Children's Museum of the Brooklyn Institute of Arts and Sciences in September 1913.
In November 1913, he left the museum for a military career beginning on the Mexican border.
When he was assigned as commandant of the Reserve Officers' Training Corps at the University of Wichita in the 1930s, he wrote scientific papers on herpetology and was curator at the Arkansas Valley Museum and Historical Society.
In 1982 the Major Chapman Grant Hall of Ecology in the San Diego Natural History Museum in Balboa Park was named in honor of him.