Nicholas III may refer to:

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  • Patriarch Nicholas III of Constantinople (died 1111), ruled 1084–1111
  • Pope Nicholas III (c. 1225–1280), ruled 1277–1280
  • Nicholas III, Lord of Mecklenburg (after 1230–1289 or 1290)
  • Nicholas III of Saint Omer (died 1314)
  • Nicholas III, Duke of Opava (c. 1339–1394)
  • Patriarch Nicholas III of Alexandria, ruled 1389–1398
  • Prince Karl Emich of Leiningen (born 1952), pretender to the Russian throne as Nicholas III

See also

  • Nicholas (disambiguation)
  • Niccolò III (disambiguation)
  • Nikola III (disambiguation)