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.
Tionesta is located at 41°29′42″N 79°27′21″W / 41.495017°N 79.455939°W / 41.495017; -79.455939. The borough is located 54 miles (87 km) SE of Erie, Pennsylvania and 78 miles (126 km) N of Pittsburgh.