Ali I may refer to:
Ali ibn Muhammad ibn Idris (died 848), Idrisid sultan of the Western Maghreb Ali I (Bavandid ruler), ruler of the Bavand dynasty from 1118 to 1142 Baba Ali Chaouch (died 1718), Dey-Pacha, or sultan of Algiers Ali bin Hussein, King of Hejaz (1879–1935), king of Hejaz from 1924 to 1925 Şehzade Ali Vasib (1903–1983), titular Sultan of Turkey and Ottoman Caliph from 1977 to 1983 under the name Ali I