The Auglaize River (Shawnee: Kathinakithiipi) is a 113-mile-long (182 km) tributary of the Maumee River in northwestern Ohio in the United States. It drains a primarily rural farming area in the watershed of Lake Erie. The name of the river was derived from the French term for it. The French called it "rivière à la Grande Glaize" (later spelled as "glaise", meaning river of Great Clay), referring to the soil in the area.