St. Peter in Ketten, Gothic church in Montabaur, Germany.

St. Peter in Ketten is a Catholic parish church in Montabaur whose present building was erected from the first half of the 13th century to about 1350. It is a three-aisled basilica with a transept, covered since the 16th century by one large pitched roof, and its side aisles are of unequal width, giving the exterior an asymmetry. Four towers rise from the light grey stone: two west towers carrying the bells, plus smaller north and south towers, all with pointed slate-covered spires.

A wooden church was built below Humbach castle in 959, replaced soon after by a stone-founded church, probably already on this site. The present building rose in stages from the first half of the 13th century to about 1350, dated by structural surveys rather than written records. After a full restoration it was reopened by Bishop Franz Kamphaus in autumn 2006.

The parish is the oldest and largest in the Catholic community of St. Peter Montabaur. Inside, visitors can see the twelve Apostle figures carved in neo-Gothic style in 1890, each base inscribed with the apostle's name, and a life-size wooden Moon Crescent Madonna of around 1450, moved here in the 1940s from the former Franciscan church.

The church stands on Kirchstraße in the old town, southeast of the Schloss, and its two west towers rise above the surrounding roofs. The south portal opens into a porch that now serves as the baptistery, while the north portal holds a copy of an early Gothic stone Madonna. The interior is entered from the street side; the low east end leaves a large wall surface above the triumphal arch for the Last Judgment painting.

The church has four towers, not two: besides the twin west towers with the bells, smaller north and south towers flank the nave. The west pair, with the gable of the nave between them, is described in the sources as probably without equal in the Westerwald region.