Tionesta is a borough in Forest County, Pennsylvania, United States. The population was 483 at the 2010 Census. It is the county seat of Forest County. The name is a Native American word meaning "waters meet."
Tionesta lies at the heart of a forested region that is a popular destination for hunters and other outdoor lovers. While the general area has seen some growth as a result of this tourist activity, the borough proper has suffered several setbacks in recent years including the closure of an Evenflo plant that was a major employer and a 2002 fire that leveled an entire block of the borough's downtown area.