Santiam Junction State Airport (ICAO: 8S3) is a public airport located adjacent to Santiam Junction in Linn County, Oregon, United States. Santiam Junction is the intersection of U.S. Route 20 and Oregon Route 22. The Oregon Department of Transportation has a maintenance facility located on the north side of the field.

The landing strip is used for emergency, recreational, and aerial firefighting. It is closed from the first snowfall until spring. The airport grounds permit fly-in camping.