The Kilchis River is a stream, about 14 miles (23 km) long, near the coast of northwest Oregon in the United States.

It drains a mountainous timbered region of about 65 square miles (170 km2) in the Northern Oregon Coast Range west of Portland.

Sharp Creek enters from the right at about 9 miles (14 km) from the mouth and just upstream of Kilchis River County Park, which is on the right.

The reserve has about 2 miles (3 km) of interpretive trails related to the site's Native American and pioneer heritage as well as its flora and fauna.

The largest Native American village on the North Oregon Coast was located here as was the home of the first white settler, Joe Champion, who arrived in 1851.