| Walter J. Conrath | |
| Nationality: | American |
| Birth Date: | January 20, 1907 |
| Institutions: | American Air Mail Society |
| Significant Projects: | President of the American Air Mail Society; wrote extensively on aerophilately |
Walter J. Conrath (January 20, 1907 – May 7, 1942), of Pennsylvania, was a stamp collector who specialized in aerophilately, the study of air mail stamps, and wrote extensively on the subject. His career was cut short when he died in an automobile accident at the age of 35.
Conrath collected air mail stamps and air mail postal history.
Walter Conrath edited and published The Airpost Journal and the American Air Mail Catalogue. He is remembered most for his 1940 book Mail Through the Air: A Review of the Development of Air Mail and Aero-Philately which continued to be republished after his death.
In addition to participating in various aerophilatelic societies, Conrath was an early member of the American Air Mail Society and was its president from 1936 to 1938.
In recognition of his influence in the field of aerophilately, Conrath was elevated to the American Philatelic Society Hall of Fame in 1942.