Trevitt's Addition Historic District is a neighborhood, primarily residential in character, located in The Dalles, Oregon, United States. Victor Trevitt platted the first expansion of the original 1855 "Dalles City" townsite in 1860, and continued to extend his addition in response to economic developments. The district saw the first flour mill and electrical and water systems in The Dalles, one of the area's earliest Catholic churches, and direct connection to transportation networks including the Columbia River Highway and the railroad. Surviving buildings in the district reflect a continuous spectrum of architectural styles from 1864 to 1937.
The historic district was listed on the National Register of Historic Places in 1995.