Mamia III Dadiani (Georgian: მამია III დადიანი; died 31 January 1533) was a member of the House of Dadiani and eristavi ("duke") of Odishi, that is, Mingrelia, in western Georgia from 1512 until his death. Mamia was a son and successor of Liparit II Dadiani, who had emerged as a semi-independent ruler in the process of dissolution of the Kingdom of Georgia. Mamia was culturally active in Abkhazia and continued his predecessors' efforts to secure borders against the North Caucasian mountainous tribes of Zygia. His naval expedition against them and landing in Zygia ended in a fiasco and Mamia was killed in battle.