Castle church is the oldest building of Varel. It is said, that the first part of the church was built in 1144. The tower was added between 1200 and 1250, originally as twin towers, which were rebuilt to today's form first in 1651 and then in 1737. The altar, font and pulpit were built 1613 – 1618 by the famous sculptor Ludwig Münstermann from Hamburg. The altar is nearly ten meters high and is one of the main work of Northern German Mannerism.
Before the Protestant Reformation, he patron saint was Saint Peter. Today, the Castle Church is a Protestant-Lutheran church, so there is no patron saint. The name “Castle Church” comes from the castle, to which buildings the church belonged in former times. The castle was pulled down in the 19th century after a fire destroyed most parts of it.