Robert I
Robert I may refer to:
- Robert I, Duke of Neustria
- Robert I of France, King of France, 922–923, rebelled against Charles the Simple
- Rollo, Duke of Normandy
- Robert I Archbishop of Rouen, Archbishop of Rouen, 989–1037, son of Duke Richard I of Normandy
- Robert the Magnificent, father of William the Conqueror. Sometimes known as Robert II, with Rollo of Normandy, c. 860 – c. 932, as Robert I because Robert was his baptismal name when he became a Christian
- Robert I, Duke of Burgundy, Duke of Burgundy, 1032-1076
- Robert I, Count of Flanders, also named Robert the Frisian, Count of Flanders, 1071–1093
- Robert I de Brus
- Robert I of Dreux, Count of Braine in France, son of King Louis VI
- Robert I of Artois, son of King Louis VIII of France
- Robert I of Scotland, also named Robert the Bruce, King of Scotland, 1306–1329, helped achieve Scotland's independence
- Robert of Naples, King of Naples, 1309–1343, son of King Charles II of Naples
- Robert Estienne, scholar-printer and son of Henry Estienne
- Rupprecht, Crown Prince of Bavaria