Bryan is a city in Williams County, Ohio, United States. The population was 8,545 at the 2010 census. It is the county seat of Williams County, and the largest city in the county.
Bryan was settled in 1840 and incorporated as a village in 1841. It was reincorporated as a city in 1941. In 1950 Bryan had a population of 6,365 people.
Bryan and Williams County were originally part of Defiance County, with Defiance being the county seat. The county seat was later moved to Bryan, and the county split into Williams and Defiance. Bryan was named the county seat, but not without conflict: the village of Montpelier was considered a more centralized location of Williams County. The people of Montpelier petitioned the state, but in the end Bryan was named county seat because of its greater industrial and commercial importance and because of its higher population. To this day, many people still argue about the state's decision.