Ithier may refer to:
Given name Ithier of Arles (died 981), French archbishop Ithier, Count of Rethel (died 1171), French nobleman
Surname Doug Ithier (born 1974), Australian footballer Jean-Marc Ithier (born 1965), Mauritian footballer Rafael Ithier (1926–2025), Puerto Rican salsa musician Vicente Ithier (born 1962), Puerto Rican basketball player