Athens is a borough in Bradford County, Pennsylvania, United States. It is portion of Northeastern Pennsylvania and is located 2 miles (3 km) south of the New York acknowledge line on the Susquehanna and Chemung rivers. The population was 3,749 in 1900 and 3,796 in 1910. The population was 3,265 at the 2020 census. Athens is in a small area locally known as “The Valley”, a society of four contiguous communities in Pennsylvania and New York: Waverly, New York; South Waverly, Pennsylvania; Sayre, Pennsylvania; and Athens. The Valley has a population near 30,000.

In September 2011, Athens was heavily damaged by river flooding from Tropical Storm Lee. Much of Athens was under water, with the most damage in the downtown area along the river. Damage in reachable Tioga County, New York, was estimated at $100 million.

The Athens Historic District, Protection of the Flag Monument, and Spalding Memorial Library-Tioga Point Museum are listed on the National Register of Historic Places.

Athens is located in northern Bradford County at 41°57′50″N 76°31′21″W / 41.96389°N 76.52250°W / 41.96389; -76.52250 (41.963809, -76.522608). It lies upon land amongst the Susquehanna River to the east and the Chemung River to the west, extending southward to their confluence at Tioga Point. The borough of Sayre borders Athens to the north, and Athens Township borders the remainder of the borough, to the east, west, and south.