The Chehalis River (/ʃəˈheɪlɪs/ ⓘ shə-HAY-liss) is located in the southwest corner of British Columbia, Canada near the city of Chilliwack.

The Chehalis is a fishing stream and, together with its tributaries such as Statlu Creek, offers opportunities for class III and IV whitewater kayaking.

Shortly after exiting the lake, it drops over impressive Statlu Falls, which is difficult to view without putting yourself in real danger.

There is a small ski resort, Hemlock Valley, on the eastern side of the Chehalis River basin.

On December 4, 2007, a large landslide entered Chehalis Lake and triggered a megatsunami with a maximum run-up height of 37.8 metres (124 ft) along the lakeshore.