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- Martin Opitz (1597–1639)
- Ernst Ortlepp (1800–1864)
- Andreas Osiander (1496–1552)
- Carl von Ossietzky (1889–1938)
- Oswald von Wolkenstein (1377–1445)
- Otfrid von Weißenburg (c. 800–after 870)
- Emine Sevgi Özdamar (born 1946)
Read more about this topic: List Of German-language Authors