One hundred seventeen species and subspecies of ostracods from the Early to Late Cretaceous (Aptian - Early Turonian) of Sinai, Egypt, are taxonomically studied, described, and illustrated. Among these, 39 species and subspecies are new. The ostracod taxa presented here belong to 61 genera and subgenera, of which seven genera and subgenera are newly established. A new subfamily belonging to the family Trachyleberididae is proposed. The occurrence of the studied taxons in the Egyptian material and their distribution elsewhere are summarized and tabulated.