St. Markus, Parish church in Wittlich, Germany.

St. Markus is a three-nave pillar basilica in Wittlich that combines late Gothic and early Baroque architectural elements and features a square, three-story tower with a slate-covered roof. The interior is defined by three parallel aisles that guide the eye from the entrance toward the choir.

Construction began in 1707 under Archbishop Johann VIII Hugo von Orsbeck, with court architect Philipp Honorius von Ravensteyn in charge. The archbishop's death in 1711 stalled the work; his collaborator Johann Georg Judas completed it in 1722/24 under Franz Ludwig von Pfalz-Neuburg, raising the tower and adding the roof turret. The church was consecrated only in 1727.

The parish is dedicated to Saint Mark the Evangelist. Its 1749 high altar was bought from the Dominican church in Koblenz and enlarged in 1927 by the sculptor Heiwegen; the side altars of 1747 come from the court joiner Conrad Fischer. The baptismal font was carved in 1727 by Lorenz Staudacher of Koblenz, and a 15th-century wooden figure of John the Baptist is kept in the church.

The modern windows were created between 1949 and 1952 and replaced those damaged during the war, helping visitors understand the restoration phases. A walk through the interior reveals how the church has maintained and renewed its structure over the decades.

The organ case from 1769, designed by Peter and Nikel Schreiber in the North German style, has retained its original appearance and was restored in 2000. This instrument showcases the craftsmanship of an era when organ building was among the most respected trades.