Omar Ali Saifuddin I (Jawi: I ??? ??? ??? ?????; died 10 July 1795) was the 18th Sultan of Brunei from 1740 until his abdication in favor of his eldest son Muhammad Tajuddin in 1778.
He succeeded his father-in-law, Sultan Hussin Kamaluddin as Sultan of Brunei upon the latter's abdication from the throne in 1740.