Dulais may refer to:
Places Dulais Valley, one of the South Wales Valleys in southwest Wales north of the town of Neath, Wales. River Dulais, a river of Wales which has its source at Mynydd y Drum. It joins the River Neath after flowing over Aberdulais Falls
People Grace Dulais Davies (born 1887 or 1888 – 1969), Welsh literature academic, winner of the Rose Mary Crawshay Prize