Kittanning is a borough and the county seat of Armstrong County in the U.S. state of Pennsylvania. It is situated 44 miles northeast of Pittsburgh, along the east bank of the Allegheny River.
The name is derived from Kithanink, which means 'on the main river' in Lenape or the Delaware language, from kit- 'big' + hane 'mountain river' + -ink. "The main river" is a Lenape term for the Allegheny and Ohio combined, which they considered as all one river. The borough and its bridge have been used as a setting for several recent films.