Connoquenessing Township is a township in Butler County, Pennsylvania, United States. The population was 4,265 at the 2020 census.

The Pittsburgh, Harmony, Butler and New Castle Railway, commonly called the Harmony Line, was a broad gauge interurban streetcar line connecting Pittsburgh, Pennsylvania, United States to Butler and New Castle via Harmony and a split at Evans City. There was also an extension that was later added to the line from Ellwood City to Beaver Falls.