Bellaire is a village in Belmont County, Ohio, United States, along the Ohio River. The population was 3,870 at the 2020 census, having peaked in 1920. It is part of the Wheeling metropolitan area.

Belmont County is a county in the U.S. state of Ohio. As of the 2020 United States census, the population was 66,497. Its county seat is St. Clairsville, while its largest city is Martins Ferry. The county was created on September 7, 1801, and organized on November 7, 1801. It takes its name from the French for "beautiful mountain".