The Hicksville and Sherwood fire departments battled a fire Wednesday night at St. Michael's Catholic Church, 100 Antwerp Drive in Hicksville.
Defiance County dispatchers were called at 8:36 p.m. Firefighters had the blaze under control in about a half hour.
Two juveniles were treated for possible smoke inhalation at the scene and released. The Ohio State Fire Marshals Office was called.
The fire remains under investigation.