Cretin may refer to:

• Cretin (medicine), an archaic term for a patient with congenital iodine deficiency syndrome (cretinism)
• a pejorative term, similar to idiot
• Crétin (surname), a french-language surname

Named after Joseph Crétin

• Cretin Hall, a residence hall at the University of St. Thomas in Saint Paul, Minnesota
• Cretin-Derham Hall High School, a co-educational Catholic high school in Minnesota

• Cape Cretin, a headland in the Huon Gulf in Papua New Guinea
• "Cretin", a song by Revocation from the album Chaos of Forms, 2011

• Parliamentary cretinism