All Souls Church, also known as the First Unitarian Society of Plainfield, is located at 724 Park Avenue in the city of Plainfield in Union County, New Jersey, United States.

[4] The church was designed in 1892 by the architect and magician Oscar Schutte Teale and features Romanesque and Late Gothic Revival architecture.

He also designed the Presbyterian Church at Bound Brook in 1896 and the Old Main at Centenary University in 1901.

The Parish House was added in 1922, designed by the architect Josiah T. Tubby.

The architect Harry Keith White redesigned the interior of the church in 1929.