Johannes Otzen (8 October 1839 in Sieseby, Schleswig-Holstein – 8 June 1911 in Berlin) was a German architect, urban planner, architectural theorist and university teacher. He worked mainly in Berlin and Northern Germany. Otzen was involved in urban planning in Berlin.
He built Gothic Revival brick buildings for the Lutheran Church, which were influential throughout Northern Germany.
1) Church of St John, Hamburg-Altona (1868–73—won in a competition in 1867)
2) Bergkirche (Hill Church),
3) Wiesbaden (1876–79),
4) Heiligekreuzkirche (Holy Cross Church),
5) Berlin-Kreuz-berg (1885–8),
7) Ludwigshafen (1892–4)
8) Ringkirche, Wiesbaden (1892–4).