St. Markus, Gothic church in Eltville am Rhein, Germany

St. Markus is a former parish church on a terraced slope on the north side of Hauptstraße in Erbach. Its late Gothic west tower, dated 1477, has a square plan, white plaster divided by sandstone-coloured cornices, a 28.5-metre masonry crown with a tracery parapet, and an octagonal slate spire reaching 56 metres. The nave is a low three-aisled hall of three bays with a small choir, extended in the 18th century.

The building began as a chapel documented between 1060 and 1072 and later evolved into an independent parish church. Major construction took place between 1477 and 1506, with significant interior modifications made in the 18th century that altered how the space felt inside.

The patron saint is Mark the Evangelist, whose symbol, the winged lion, appears in Erbach's traditional coat of arms. Since 2016 St. Markus has been a branch church of the parish of St. Peter and Paul Rheingau, whose parish church is in Eltville. Concerts are held in the building, among them an organ recital by Ignace Michiels during the 2002 Rheingau Musik Festival.

The church stands at Hauptstraße 46 in Erbach, on the north side of the road on a terraced slope between the western entrance to the village and the market, opposite Schloss Reinhartshausen. A pointed-arch portal on the west side of the tower leads barrier-free onto the paved steep ramp between the main street and the cemetery.

The organ was built in 1981 by Förster & Nicolaus of Lich inside the 1725 case by Johannes Kohlhaas the Elder; Bernhard Sucker restored the case front and H.W. Fillmann of Eltville-Erbach overhauled it. Its 27 stops sit on two manuals and pedal, with the first manual a coupling manual and mechanical action. Ignace Michiels played it at the 2002 Rheingau Musik Festival.