Walter Willis Granger [1] (November 7, 1872 – September 6, 1941) was an American vertebrate paleontologist who participated in important fossil explorations in the United States, Egypt, China and Mongolia.

Granger developed an early interest in taxidermy; and in 1890, at age 17, he obtained a job working as a taxidermist with a friend of his father's at the American Museum of Natural History in New York City.

The Fayum region of Egypt contained one of the most complete assemblages of Cenozoic animals yet found and yielded a collection of specimens that enhanced the museum's reputation as well as Granger's.

Under the direction of Johan Gunnar Andersson, Granger helped open and begin excavating the site at Zhoukoudian that yielded "Peking Man" (Homo erectus pekinensis).

Although Granger was one of the foremost paleontologists of his time, he did not receive a formal academic degree until 1932 when Middlebury College in Vermont awarded him an honorary doctorate.