St John's Church, Evangelical Lutheran church in Altona, Hamburg, Germany

St. John's Church is a neo-Gothic basilica of yellow glazed brick, built 1868–1873 to a design by Johannes Otzen. Very low, narrow side aisles flank a large, centrally planned crossing; the interior, seating up to 600, is articulated in bricks of different colours. The slender tower rises 83 metres, and the windows of 1997 are by Eun Nim Ro.

In 1855 Altona had over 40,000 mostly Lutheran residents but only the Trinitatis and Heiliggeist churches, so the parish was split in 1862. After the German-Danish War, Henning Dohrn became first pastor in 1866 and a 1867 competition drew 33 designs; Johannes Otzen won despite exceeding the budget. Construction of the "Norderkirche" began in 1868 beside the Norderreihe cemetery, now Wohlerspark, and it was consecrated on 3 April 1873.

Since 1998 the building has been run as Kulturkirche Altona: the parish rents it to a limited company for cultural and commercial events, while services and church music continue. From January 2011 the company has organised its own events, with profits going to a foundation that helps homeless and needy people. The church is open to visitors on Sundays after the service.

The building sits on Max-Brauer-Allee and is easy to reach from Johannesplatz. Visitors should note that opening hours vary depending on whether attending services or cultural events.

The tower, 83 metres tall, was the highest structure in Altona when built. Its brick spire had to be demolished and rebuilt in 1885 because of serious construction defects. Three bells cast in 1872 by the Bochumer Verein hang in the tower, among that foundry's early works.