Kittanning /kɪˈtænɪŋ/ is a borough and the county seat of Armstrong County in the U.S. state of Pennsylvania. It is situated 44 miles (71 km) northeast of Pittsburgh, along the east bank of the Allegheny River. The name Kithanink means 'on the main river' in the Delaware language, from kit- 'big' + hane 'mountain river' + -ink (suffix used in place names). "The main river" is a Lenape epithet for the Allegheny and Ohio, considered as all one river.