Northwood is a small, unincorporated community crossroads village in northern Logan County, Ohio, United States. It lies along the line between Richland Township and McArthur Township, approximately two miles south of the village of Belle Center and near the South Fork of the Great Miami River. Northwood was founded in the early 19th century, during the early years of settlement in Logan County. Its primary significance lies in its being the original site of Geneva College.

Logan County is a county in the west central portion of the U.S. state of Ohio. As of the 2020 census, the population was 46,150. The county seat is Bellefontaine. The county is named for Benjamin Logan, who fought Native Americans in the area.