The Robinson Fork is a headwater stream of the Touchet River, about long, in Columbia County, Washington. Originating in the northern Blue Mountains near Griffin Peak, it flows north through a narrow valley in between Robinette Mountain (to the west) and Newby Mountain. It empties into the Wolf Fork at the small community of Mountain Home Park. The Wolf Fork joins the North Fork Touchet River, which in turn joins with the South Fork Touchet River near Dayton to form the main stem of the Touchet.