IAU nomenclature: O'Day Oberth Oblivionis, Lacus Obruchev Odii, Lacus Oenopides Oersted Ohm Oken Olbers Olcott Old Nameless (Apollo-14 site) Olivier Omar Khayyam Onizuka Opelt Opelt, Rimae Oppel, Dorsum Oppenheimer-/ Oppolzer Oppolzer A (very near the point at 0°North/ 0°East) Oppolzer, Rima Oresme-/ Orientale, Mare (Basin) Orlov Orontius Osama Osiris Osman Ostwald-/ Owen, Dorsum
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Unofficial nomenclature: O'Kell (Atlas E) O'Neill (+730/ +260) O'Neill's Bridge Object A (Mare Ingenii) Ocariz (IAU: Julius Caesar) Occidentalior, Insula (location unknown) Offset (Apollo-15 site) Olbers, Rimae (on the floor of Olbers) Olblatt (Hansen B) (Wilkins's Lower) Olcott, Catena Old Deep (Apollo-14 site) Old North (Apollo-14 site) Olivium, Promontorium (discontinued name?) Olympus, Mons (IAU: Hipparchus) Oncoming hills (Luna 21 / Lunokhod 2 site) (in Le Monnier) Opelt G, Rimae (small cluster of rilles ESE Opelt G) Ophiusa, Insula (IAU: Montes Teneriffe Delta, etc.) Oppenheimer, Rimae (on the floor of Oppenheimer) Opticus, Sinus (IAU: Sinus Amoris) Oriani* (discontinued name) Orient, Paludes (NW edge of Oceanus Procellarum) Orientale Dark Mantle Ring Deposit (aka Mare Pacificus) Orientale Secondary chains Orientalior, Insula (location unknown) Orientalis, Sinus (IAU: probably north of Mare Humorum) Orientalis, Sinus (western end of Mare Frigoris) Origanus (Darney Tau and Chi) Oris (see Brisbane, Brisbane Z) (and description below list) Orus (Petavius B) Orville (Orville Wright) (Apollo-15 site) Os (Apollo-15 site) O.Schmidt (see Schmidt) Ossolinski (IAU: Sirsalis A) (Wilkins's Bertaud) Osymandies (IAU: Mercurius) Outer Hevelius Formation Outhouse Rock (Apollo-16 site) Owl, The (Aristarchus/Herodotus/Vallis Schroteri) Oxensterni (IAU: Snellius)
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