Domnall mac Murchada (died 1075), also known as Domnall mac Murchada meic Diarmata, was a leading late eleventh-century claimant to the Kingdom of Leinster, and a King of Dublin. As a son of Murchad mac Diarmata, King of Dublin and the Isles, Domnall was a grandson of Diarmait mac Máel na mBó, King of Leinster, and thus a member of the Uí Chennselaig. Domnall was also the first of the Meic Murchada, a branch of the Uí Chennselaig named after his father.