Fulton County is a county located in the U.S. state of Ohio west of Toledo. As of the 2020 census, the population was 42,713. Its county seat and largest city is Wauseon. The county was created in 1850 with land from Henry, Lucas, and Williams counties and is named for Robert Fulton, inventor of the steamboat. Fulton County is a part of the Toledo metropolitan area.

Robert Fulton was an American engineer and inventor who is widely credited with developing the world's first commercially successful steamboat, the North River Steamboat. In 1807, that steamboat traveled on the Hudson River with passengers from New York City to Albany and back again, a round trip of 300 nautical miles, in 62 hours. The success of his steamboat changed river traffic and trade on major American rivers.