The Qarmatians ("Those Who Wrote in Small Letters"; also transliterated "[C/Q/K]armathians",) are a Shi'a Ismaili group centered in eastern Arabia, where they attempt to establish a utopian republic in 899 CE.

They are most famed for their revolt against the Abbasid Caliphate.

Mecca is sacked by the sect’s leader Ṭāhir Sulaymān, outraging the great majority of other Muslims, particularly with their theft of the Black Stone and desecration of the Well of Zamzam with corpses during the Hajj season of 930 CE.The Qarāmaṭah are also known as "the Greengrocers" (al-Baqliyyah) because of their strict vegetarian habits.