Ralph I may refer to:
Rudolph of France (c. 890 – 936) Ralph I of Périgord (d. 975) Ralph I, Count of Vermandois (1085–1152) Ralph I, Lord of Coucy (c. 1134 – 1191) Ralph I, Count of Eu (b. 1160/1165 – d. 1219) Raoul I of Brienne, Count of Eu (d. 1344) The fictional King Ralph
See also Ralph (disambiguation) Raoul (disambiguation) Raul (disambiguation)