| Name | Country | Feature class | Latitude | Longitude | |
|---|---|---|---|---|---|
2351  | Ouldou Ouldou,Talla | Chad, Chari-Baguirmi | populated place | N 11° 39′ 22'' | E 15° 11′ 53'' |
| 2352 | Ouka Atim Ouka Atim,Ouka et Tin | Chad, Hadjer-Lamis | populated place | N 12° 25′ 45'' | E 15° 3′ 38'' |
2353  | Ouitapango Ouitapango | Chad, Guéra | hill | N 11° 30′ 44'' | E 17° 33′ 50'' |
| 2354 | Ouitadagourou Ouitadagourou | Chad, Guéra | mountain elevation 700m | N 11° 31′ 0'' | E 17° 32′ 36'' |
| 2355 | Wir Wir Ouir Ouir,Wir Wir | Chad, Batha | populated place | N 13° 27′ 50'' | E 19° 59′ 34'' |
2356  | Ouinjélé Ouindjeri,Ouindjéri,Ouinjele,Ouinjele Fouga,Ouinjélé,Ouinjélé Fouga | Chad, Logone Oriental | intermittent stream | N 8° 1′ 23'' | E 16° 24′ 15'' |
| 2357 | Ouli Ouili,Ouli | Chad, Lac | blowout(s) | N 13° 39′ 8'' | E 14° 35′ 14'' |
| 2358 | Ouénabdou Ouenabdou,Ouendou Abdou,Ouénabdou | Chad, Chari-Baguirmi | populated place | N 10° 53′ 4'' | E 15° 56′ 12'' |
| 2359 | Oual Tèndjèn Oual Tendjen,Oual Tèndjèn,Ouel Tendjen | Chad, Hadjer-Lamis | populated place | N 12° 53′ 24'' | E 15° 1′ 52'' |
| 2360 | Ouelgagé Ouelgage,Ouelgague,Ouelgagué,Ouelgagé | Chad, Hadjer-Lamis | populated place | N 12° 3′ 26'' | E 17° 24′ 48'' |
| 2361 | Oubi Oubi,Ouly | Chad, Guéra | populated place | N 11° 46′ 38'' | E 18° 32′ 26'' |
| 2362 | Ouasse Ouase,Ouasse | Chad, Chari-Baguirmi | populated place | N 11° 53′ 43'' | E 15° 10′ 54'' |
| 2363 | Wartanga Ouartanga,Wartanga | Chad, Batha | populated place | N 13° 40′ 24'' | E 19° 47′ 47'' |
| 2364 | Ouarouan Ouariouan,Ouarouan | Chad, Moyen-Chari | populated place | N 9° 14′ 55'' | E 18° 3′ 49'' |
| 2365 | Ouantago Ouantago,Ouantagoi,Ouantagoï | Chad, Tibesti | mountain | N 21° 35′ 0'' | E 16° 28′ 0'' |
| 2366 | Ouan Ouan,Ouan I | Chad, Lac | populated place | N 13° 23′ 0'' | E 14° 59′ 0'' |
| 2367 | Ouan Ouan,Ouan II | Chad, Lac | populated place | N 13° 22′ 0'' | E 14° 59′ 0'' |
| 2368 | Oua Moungui Oua Moungi,Oua Moungui | Chad, Mayo-Kebbi Ouest | hill | N 9° 32′ 54'' | E 14° 41′ 47'' |
| 2369 | Ouolo Oualo,Ouolo | Chad, Logone Occidental | populated place | N 8° 32′ 44'' | E 15° 19′ 5'' |
| 2370 | Ouedda Oualdda,Ouedda | Chad, Mayo-Kebbi Est | populated place | N 9° 58′ 33'' | E 15° 13′ 59'' |
| 2371 | Oualassa Oualasa,Oualassa | Chad, Chari-Baguirmi | populated place | N 11° 6′ 1'' | E 15° 47′ 7'' |
| 2372 | Ouala Ouala | Chad, Guéra | mountain elevation 702m | N 11° 43′ 42'' | E 17° 53′ 43'' |
| 2373 | Oua Gong Kassala Oua Gong Kasala,Oua Gong Kassala | Chad, Mayo-Kebbi Ouest | hill | N 9° 30′ 14'' | E 14° 52′ 1'' |
| 2374 | Ouadjigi Ouachtigui,Ouachtiguï,Ouadjigi | Chad, Kanem | populated place | N 14° 19′ 14'' | E 15° 23′ 55'' |
| 2375 | Ouadang Ouadang,Woadang | Chad, Mayo-Kebbi Est | populated place | N 10° 39′ 53'' | E 15° 8′ 45'' |
| 2376 | Oua Oua | Chad, Guéra | mountain elevation 1091m | N 11° 1′ 57'' | E 17° 54′ 38'' |
| 2377 | Ouroungou Oroungou,Ouroungou | Chad, Tandjilé | populated place | N 9° 36′ 9'' | E 16° 37′ 45'' |
| 2378 | Ehi Orom Ehi Orom | Chad, Borkou | mountain | N 20° 9′ 0'' | E 18° 30′ 0'' |
| 2379 | Ehi Orobo Ehi Orobo,Mont Kennehar Ehi Orobo | Chad, Tibesti | mountain | N 21° 18′ 0'' | E 15° 57′ 0'' |
| 2380 | Ehi Orda Inchilé Ehi Orda Inchile,Ehi Orda Inchilé,Ehi Orda-Inchille,Ehi Orda-Inchillé | Chad, Tibesti | hill | N 22° 4′ 0'' | E 17° 45′ 0'' |
| 2381 | Onour Onnour,Onnur,Onour | Chad, Borkou | well | N 19° 44′ 45'' | E 18° 10′ 34'' |
| 2382 | Onglé Ongle,Onglé,Ongole,Ongolé | Chad, Guéra | populated place | N 11° 25′ 37'' | E 18° 21′ 3'' |
| 2383 | Ondoum Ondoum | Chad, Guéra | hill elevation 487m | N 11° 16′ 49'' | E 17° 49′ 10'' |
| 2384 | Ongtanian Omteyon,Ongtanian | Chad, Mandoul | populated place | N 8° 17′ 48'' | E 17° 43′ 39'' |
| 2385 | Oual Hassan Ole Hasan,Oual Hassan | Chad, Hadjer-Lamis | populated place | N 12° 55′ 27'' | E 15° 16′ 57'' |
| 2386 | Oual Adam Tortéri Ole Adam Torteri,Oual Adam Torteri,Oual Adam Tortéri | Chad, Hadjer-Lamis | populated place | N 12° 56′ 52'' | E 15° 16′ 37'' |
| 2387 | Oinguéloba Oingeloba,Oingueloba,Oinguéloba,Oingéloba | Chad, Mayo-Kebbi Ouest | populated place | N 8° 53′ 53'' | E 14° 53′ 48'' |
| 2388 | Ogoulo Ogoulo | Chad, Guéra | hill | N 12° 22′ 51'' | E 19° 33′ 50'' |
| 2389 | Ogol Ogol,Ogul | Chad, Mayo-Kebbi Est | populated place | N 10° 22′ 27'' | E 15° 18′ 3'' |
| 2390 | Oguet Oget,Oguet | Chad, Guéra | populated place | N 12° 0′ 21'' | E 18° 56′ 54'' |
| 2391 | Odok Adok,Odok | Chad, Guéra | populated place | N 12° 24′ 33'' | E 19° 16′ 32'' |
| 2392 | Oban Abon,Oban | Chad, Chari-Baguirmi | populated place | N 11° 17′ 5'' | E 15° 24′ 4'' |
| 2393 | Nokoro Nakourou,Nokoro | Chad, Logone Oriental | populated place | N 8° 5′ 0'' | E 15° 45′ 0'' |
| 2394 | Nodjimala Madjimala,Nodjimala | Chad, Moyen-Chari | populated place | N 8° 41′ 12'' | E 18° 26′ 52'' |
| 2395 | N'Djari N'Djari,Ndjari,Njair,Njaire,Njairé | Chad, N’Djaména | section of populated place | N 12° 7′ 20'' | E 15° 5′ 41'' |
| 2396 | Njagou Njagou,Njagu | Chad, Logone Oriental | populated place | N 8° 15′ 58'' | E 15° 30′ 28'' |
| 2397 | Niou Niou,Niu | Chad, Moyen-Chari | populated place | N 9° 47′ 56'' | E 17° 45′ 47'' |
| 2398 | Ninga Ninga,Ninnga | Chad, Tandjilé | populated place | N 9° 31′ 15'' | E 16° 21′ 23'' |
| 2399 | Id el Nimer Id el Nimer,Nimer | Chad, Batha | populated place | N 13° 34′ 51'' | E 19° 9′ 41'' |
| 2400 | Nyan  Mane Nian,Mané Nian,Nyan | Chad, Logone Oriental | stream | N 8° 8′ 16'' | E 15° 50′ 57'' |
by