Otia Dadiani (Georgian: ოტია დადიანი; died 1757), of the House of Dadiani, was Prince of Mingrelia from 1728 until his death. Like his predecessors, Otia Dadiani was embroiled in a series of civil wars that plagued western Georgia. He spent years fighting King Alexander V of Imereti with varying fortune. In the last years of his rule, Otia reconciled and corroborated with the Imeretian monarchy.