Westfir is a city in Lane County, Oregon, United States. The population was 253 at the 2010 census. It is located about 40 miles (64 km) southeast of Eugene and about 4 miles (6 km) west of Oakridge in the Willamette National Forest.

Lane County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 382,971, making it the fourth-most populous county in Oregon. The county seat is Eugene, the state's second most populous city. It is named in honor of Joseph Lane, Oregon's first territorial governor.