St. Johannes, Baroque church in Castell, Germany

St. Johannes is the Evangelical Lutheran parish church of Castell, standing in the Oberdorf on the slope of the Herrenberg. It is a hall church (Saalbau) oriented to the southwest rather than east, with a facade tower on the northeast side. The present building was erected in 1784–1792 to designs by Würzburg building inspector Joseph Albert.

St. Johannes was first documented as a parish church in the 13th century, though its John the Baptist dedication points to an early Christian baptismal church. After war damage left the building 'gantz baufällig', it was demolished in 1783. Joseph Albert of Würzburg produced the final designs, construction began in 1784, and the church was consecrated in 1788, completed in 1792.

The church's patron is John the Baptist, a dedication pointing to its early use as a baptismal church for the mission among the East Franks. The Counts of Castell kept patronage rights and a private lodge in the church, and until 1969 held the right to appoint the pastor. Since 1806 the former county church has belonged to a Bavarian deanery.

The church is located on St.-Johannes-Straße in Castell and is open for visitors to explore. For guided tours, advance contact with the local parish office is recommended.

The church is not oriented eastward like most churches but faces southwest, with the facade tower on the northeast side. The building is listed as a Bavarian monument under the number D-6-75-116-14.