Simeon I may refer to:

Simon I (High Priest) (310–291 or 300–270 BCE), in the Temple in Jerusalem Simeon I, Caucasian Albanian Catholicos in 706–707 Simeon I of Bulgaria (864/865 – 927) Simeon of Moscow, Simeon Ivanovich Gordyi (the Proud), (1316–1353), Prince of Moscow and Grand Prince of Vladimir Simeon I of Yerevan, Catholicos of All Armenians in 1763–1780

See also Simon I (disambiguation)