Saint John the Baptist Orthodox church in Gvardeisk, Orthodox church in Gvardeisk, Russia.

Saint John the Baptist Orthodox Church is a plastered brick church, 32.8 by 11.7 metres, with no separate choir and a west tower topped by an octagonal tiled pyramid roof reaching 30 metres. A sacristy stands on the north side. It faces the old market square, now Victory Square, in Gvardeisk.

A first wooden church was built on Tapiau's market square in 1502. It burned in 1661 and again in 1689, then was rebuilt in stone by 1694; the nave was extended eastward in 1764/67 and an organ installed in 1810. The church survived World War II largely intact, was used as a warehouse and shop in the Soviet period, and was handed to the Russian Orthodox Church in 1989, consecrated on 15 April 1991 by Metropolitan Kirill.

The church keeps the name of John the Baptist, to whom it was consecrated by Metropolitan Kirill on 15 April 1991. Inside, an iconostasis installed during the 1990s restoration follows Orthodox tradition. The building was a Lutheran town church until 1945, and a German-language congregation formed again in Gvardeisk in 1997.

The church stands on Ploshchad Pobedy, the former western market square, in the centre of Gvardeisk, about 20 km east of Kaliningrad on the A229 road. The railway station lies south of the Deima and Pregolya rivers. The building is a working Orthodox church, so visitors should dress modestly and keep to the edges during services.

The church kept two bells cast in 1684 and 1840, and its tower carries a tiled octagonal pyramid roof reaching 30 m. Lovis Corinth, born in Tapiau in 1858, gave his baptismal church a triptych of Golgotha in 1910; it was saved in World War I but lost in 1945.