Corvallis (IPA: [ˌkɔɹ ˈvæl ɪs]) is a city located in central western Oregon, USA. Originally called Marysville, (probably for the nearby Marys River), the legislative assembly changed the city's name to Corvallis in 1853, from the Latin phrase cor vallis, meaning "heart of the valley." Corvallis was incorporated as a city in 1857. It is the county seat of Benton County^GR6.

As of July 2004, the city has an estimated population of 50,380.

Its daily newspaper, The Corvallis Gazette-Times has a weekday circulation of 11,524 and a Sunday circulation of 12,021.

The campus of Oregon State University, which is the major local employer, is located near the edge of the main downtown area. Another large employer is Hewlett-Packard, whose printer cartridge manufacturing and prototyping facility is located in the northeast area of town. A number of residents commute to work from nearby Albany.

Corvallis is admired for its tree-lined streets and numerous parks, its historic courthouse, storefronts, homes, and other structures, its traditional downtown--with small shops and restaurants, and its Riverfront Commemorative Park, which runs along the Willamette River, on the eastern edge of downtown. Designated a "Bike-Friendly City," Corvallis has many miles of bike paths, trails, and roadside bicycle lanes. The 577 acre (2.34 km²) Oregon State University campus complements the city with its abundance of trees and handsome buildings. The university also brings a wealth of educational, research, and cultural resources to the community, as well as major college sports events.