Alt-St. Nikolaus, Romanesque church in Kessenich, Germany

Alt-St. Nikolaus is a three-aisled church in Kessenich with a square tower on its west side, built as a hall church in the mid-11th century. The left aisle was added around 1590 and the right aisle in 1749/1750. The church stands at the corner of Nikolausstraße and Rosenburgweg and is a protected monument.

Alt-St. Nikolaus goes back to a hall building from the mid-11th century, making it one of Bonn's oldest surviving churches. The left aisle was added around 1590, the right aisle in 1749/1750. After the new parish church was completed in 1891, the old church was closed; renovations followed in 1935/1936 and 1965–1970.

Since its restoration, Alt-St. Nikolaus has hosted not only Masses and church celebrations but also secular events. Latin Mass in the extraordinary form of the Roman Rite, with Gregorian chant, is celebrated here. The church stands at the corner of Nikolausstraße and Rosenburgweg, and its name recalls Saint Nicholas, patron of the Kessenich parish.

Alt-St. Nikolaus stands at the corner of Nikolausstraße and Rosenburgweg in Kessenich, a short walk from the district's streets and reachable on foot or by bike. Since its reopening it has hosted masses, church celebrations and secular events, so access depends on those occasions rather than fixed visiting hours.

The baptismal font inside was crafted from Drachenfels trachyte stone in 1571 and displays the skilled craftsmanship of that era. This work in local stone remains a notable detail that speaks to the religious practices of an earlier time.