Robert III may refer to:
- Robert III of Worms (800–834)
- Robert III, Duke of Normandy (c. 1051 or 1054 – 10 February 1134)
- Robert III, Prince of Capua (1153–1158)
- Robert III of Loritello (died 1182)
- Robert III de Brus (fl. 12th century, died ca. 1191)
- Robert III, Count of Dreux (1185–1234)
- Robert III, Count of Flanders (1249 – September 17, 1322)
- Robert III of Artois (1287–1342)
- Robert III of Scotland (c. 1337–April 1406)
- Robert III de La Marck (1491–1537)
Famous quotes containing the word iii:
“The army is the true nobility of our country.”
—Napoleon Bonaparte III (1808–1873)