Simon I may refer to:
Simon I (High Priest) (310–291 or 300–270 BCE) Simon I of Montfort (1025–1087) Simon I de Senlis, Earl of Huntingdon-Northampton (died c. 1111) Simon I, Duke of Lorraine (1076–1138) Simon I, Count of Saarbrücken (died >1183) Simon I, Count of Tecklenburg (c. 1140–1202) Simon I, Count of Sponheim-Kreuznach (1210/15–1264) Simon I of Isenburg-Kempenich, Lord of Isenburg-Kempenich from 1329 until 1341 Simon I, Lord of Lippe (c. 1261–1344) Simon I of Kartli (1537–1611) Simon I Gurieli
See also Simeon I (disambiguation)