Nicholas III

Nicholas III may refer to:

• 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