The Sweltzer River is a river in British Columbia, Canada, that drains the waters of Cultus Lake into the Chilliwack River. It is about 3 km long, and much of it runs through Soowahlie Indian Reserve No. 14, which is under the administration of the Soowahlie Indian Band. The name Sweltzer River was applied on an 1895 map to Liumchen Creek, which is to the northeast.