Walter David Pugh (April 4, 1863 – November 23, 1946) was a prominent architect in Salem, Oregon, United States. The son of a carpenter, Pugh began designing buildings in Salem when there were only a few thousand residents, and in nearby Eugene when it had a little over a thousand residents. Pugh designed Salem's Oregon State Hospital buildings being constructed in 1907-1908, including an addition to the "J Building", which has since been demolished. A number of his buildings are listed on the National Register of Historic Places (NRHP).