Map of the Maumee River watershed showing the Auglaize River.
|Origin||2 mi (3.2 km) south of Harrod|
|Mouth||Maumee River at Defiance|
|Length||113 miles (182 km)|
|Source elevation||~ 990 ft (302 m) |
|Mouth elevation||~ 665 ft (203 m) |
|Basin area||2337 mi² (6053 km²) |
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 either comes from a French term for "frozen water."
It rises in southeastern Allen County, approximately 10 miles (16 km) southeast of Lima and 12 miles (19 km) north of Indian Lake. It flows southwest to Wapakoneta, then generally north in a zigzag course, past Delphos, Fort Jennings and Oakwood. It joins the Maumee from the south at Defiance, approximately 2 miles (3 km) east of the mouth of the Tiffin River.
It receives the Ottawa River from the southeast in western Putnam County, northwest of Lima. It also receives the Blanchard River in western Putnam County. It receives the Little Auglaize River from the south in eastern Paulding County. It receives Flatrock Creek from the west in northeastern Paulding County.
During the days of the Ohio Country in the 18th century, the area around the river was inhabited by the Ottawa. Fort Amanda, constructed along the river southwest of Lima in 1812, was an important American outpost during the War of 1812. Fort Defiance was constructed in 1794 near the confluence of the Auglaize and the Maumee by General Mad Anthony Wayne.
 Variant names
- Au Glaize River
- Auglaise River
- Cowthenake sepe
- Glaize River
- Grand Au Glaze River
- Grand Glaise River
- Grand Glaize River
- Great au Glaise River
 See also
- List of Ohio rivers
- Chief Pontiac
- Grandglaize Creek, tributary of the Lake of the Ozarks which is also uses the Auglaize name
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed May 19, 2011
- U.S. Geological Survey. Harrod quadrangle, Ohio. 1:24,000. 7.5 Minute Series. Washington D.C.: USGS, 1961.
- U.S. Geological Survey. Defiance East quadrangle, Ohio. 1:24,000. 7.5 Minute Series. Washington D.C.: USGS, 1988.
- A Guide to Ohio Streams. Chapter 10: Major Ohio Watersheds (pdf)
- "Shawnees Webpage". Shawnee's Reservation. 1997. Retrieved 2013-04-26.
- U.S. Geological Survey Geographic Names Information System: Auglaize River