Berlin is an unincorporated community in northern Florence Township, Williams County, Ohio, United States.^[1] It is located in the northwest corner of Ohio, approximately two miles from Indiana and 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 942 feet above sea level.^[1]