Sultan Omar Riayat Shah ibni Almarhum Sultan Ahmad Muazzam Shah I, also known as Baginda Omar, was both the 6th and 9th Sultan of Terengganu, having ascended to the throne twice, first in 1831 and again from 1839 to 1876. Baginda means "the Fortunate" but in its actual use in Malay history is better translated as "the Conqueror".