Geoffrey I may refer to:
Geoffrey I, Count of Anjou (died 987) Geoffrey I, Duke of Brittany (980–1008) Geoffrey I of Provence (died between 1061 and 1063) Geoffrey I of Conversano or Geoffrey the Elder (died September 1100) Geoffrey I of Villehardouin (c. 1169–c. 1229) Geoffrey I of Vianden (1273–1310)