The Douglas Main Post Office in Douglas, Wyoming, United States, was built in 1909 as part of a facilities improvement program by the United States Post Office Department. The post office in Douglas was nominated to the National Register of Historic Places as part of a thematic study comprising twelve Wyoming post offices built to standardized USPO plans in the early twentieth century.

• Photographs of the Douglas Post Office at the National Park Service's NRHP database
• Douglas Main Post Office at the Wyoming State Historic Preservation Office