Berlin is an unincorporated community in northern Florence Township, Williams County, Ohio, United States. It is one of the places nearest the northwestern corner of Ohio, located less than two miles from Indiana and about six miles from Michigan. It lies along State Route 49, a short distance south of the Ohio Turnpike.
It is located at latitude 41° 36' 34" north and longitude 84° 45' 16" west. The elevation is 941 feet above sea level.
Coordinates: 41°36′34″N 84°45′16″W / 41.60944°N 84.75444°W