St. Johanniskirche, Gothic brick church in Oederquart, Stade district, Lower Saxony, Germany

St. Johanniskirche is a long, single-nave brick church with a polygonal choir and a massive west tower dating from the first half of the 14th century. The three western bays of the south side and all buttresses were rebuilt in 1793–94, when flat-arched wooden mullioned windows were inserted into the stepped Gothic openings. The interior, vaulted originally, has had a flat ceiling since 1794; the present ceiling dates from 1906–07.

The church was built around 1330 and has served as a central place for the community of Oederquart since that time. It underwent major changes, particularly on its south side in the late 1700s, and the notable organ was built by famous organ maker Arp Schnitger starting in 1679 and has been restored several times.

The church is named after John the Evangelist, whose relief appears on the 1459 bell cast by Hermann Klinghe, alongside a Madonna with Child. The parish celebrated the bell's 500th anniversary by commissioning two new bells from the Rincker foundry in Sinn, following a disposition by expert Alfred Hoppe. The three bells hang in a historic wooden bell frame.

The main entrance is the tall pointed-arch portal in the western bay of the north side, flanked by pointed-arch niches; the south side was rebuilt in 1793–94. The flat ceiling installed in 1794 and renewed in 1906–07 makes the interior easy to survey from the entrance. The organ, with Arp Schnitger's 1679–82 case, stands on the west gallery, reached by stairways within the church.

The organ was partly built by Arp Schnitger, one of northern Germany's most celebrated organ makers, starting in 1679 and ranks among the region's most notable instruments. The largest bell dates from 1459 and was cast by a Bremen bell founder, demonstrating how these instruments have endured through centuries.