Harmony is a borough in Butler County, Pennsylvania, United States.

Harmony is located in southwestern Butler County, along the northeastern border of the borough of Zelienople.

Pennsylvania Route 68 passes through the borough, just south of the downtown and leads west into Zelienople and east 17 miles (27 km) to Butler, the county seat.

He was searching for a place for his followers to worship, farm and put into effect Rapp's communal religious teachings.

The settlements were economically successful, producing many goods in a clothing factory, a sawmill, a tannery, and from their vineyards and distillery.

The society exerted a major influence on the economic development of western Pennsylvania.

The Mennonite community in Harmony lasted until around 1904, by which time the town was selling more and more individual plots.

Thanks to local Boy Scout Troop 457 of Zelienople, a set of steps were built leading up to the seat as part of an Eagle Scout project for Christopher Van Arsdale of Harmony.

In the series, it is Bastion's hometown, whose entire population, including his own mother, was converted by him into Prime Sentinels.