- Orlov Revolt (1770), Morea, Morea
- Orman, Joseph, Romania (Ottoman)
- Örneklerle Türk–Yahudi Basınının Tarihçesi (History of Turkish–Jewish Press with Examples, Benbanaste), Benbanaste, Nesim
- Orot Elim (Rams’ Skins, Eliezer ben Isaac Papo), Papo, Eliezer
- Orot ha-Ḥayyim-Yefa’er ‘Anavim (Sidi Fredj ben Abraham Ḥalimi), Ḥalimi, Sidi Fredj
- orphans, education of, Education
- Orphans’ Decree (gezerat ha-yetomim, Yemen), Conversion
- ORT seeOrganization of Rehabilitation through Training
- Ortaköy neighborhood (Istanbul), Jewish community in, Istanbul, Ottoman Empire
- Ortayli, I…