The Baroque church was built in 1666–70. It is one of the oldest Protestant Saalkirchen in Lower Saxony, conceived for the sermon as the main act of the Lutheran church service.

Mathematician and philosopher Gottfried Wilhelm Leibniz and Field Marshal Carl August von Alten are buried here.

The church is known for its church music, performed in service and concert by the St. John’s chorale , and serves as a venue for concerts, for example in the context of the Expo 2000 and the Kirchentag.

It houses a “Spanish organ”, suitable for early Baroque music, in collaboration with the Hochschule für Musik und Theater Hannover.

Architecture
The Neustädter Kirche shows the characteristics of a rigorous early Baroque style, still based on antique models. It is one of the oldest Protestant Aisleless church in Lower Saxony, conceived for the sermon as the main act of Lutheran church service.

It is a long and spacious hall church, which closes to the east with a slightly narrower chancel. It has a large organ balcony to the west and small balconies along the south and north sides.