Hawthorn is a borough in Clarion County, Pennsylvania, United States.

[3] Hawthorn is located in southeastern Clarion County at 41°1′14″N 79°16′27″W / 41.02056°N 79.27417°W / 41.02056; -79.27417 (41.020621, -79.274163),[4] on the north side of Redbank Creek, a westward-flowing tributary of the Allegheny River.

The creek forms the boundary with Armstrong County to the south.

There were 220 housing units at an average density of 198.6 per square mile (76.7/km2).

20.2% of all households were made up of individuals, and 13.6% had someone living alone who was 65 years of age or older.