| Hume's Wheatear Oenanthe albonigra | Passeriformes / Muscicapidae | LC |
| Buff-breasted Wheatear Oenanthe bottae | Passeriformes / Muscicapidae | LC |
| Red-tailed Wheatear Oenanthe chrysopygia | Passeriformes / Muscicapidae | LC |
| Cyprus Wheatear Oenanthe cypriaca | Passeriformes / Muscicapidae | LC |
| Sombre Rock Chat Oenanthe dubia | Passeriformes / Muscicapidae | DD |
| Familiar Chat Oenanthe familiaris | Passeriformes / Muscicapidae | LC |
| Finsch's Wheatear Oenanthe finschii | Passeriformes / Muscicapidae | LC |
| Rusty-breasted Wheatear Oenanthe frenata | Passeriformes / Muscicapidae | LC |
| Brown Rock Chat Oenanthe fusca | Passeriformes / Muscicapidae | LC |
| Heuglin's Wheatear Oenanthe heuglinii | Passeriformes / Muscicapidae | LC |
| Western Black-eared Wheatear Oenanthe hispanica | Passeriformes / Muscicapidae | NE |
| White-crowned Wheatear Oenanthe leucopyga | Passeriformes / Muscicapidae | LC |
| Black Wheatear Oenanthe leucura | Passeriformes / Muscicapidae | LC |
| Mourning Wheatear Oenanthe lugens | Passeriformes / Muscicapidae | LC |
| Arabian Wheatear Oenanthe lugentoides | Passeriformes / Muscicapidae | LC |
| Abyssinian Wheatear Oenanthe lugubris | Passeriformes / Muscicapidae | LC |
| Blackstart Oenanthe melanura | Passeriformes / Muscicapidae | LC |
| Red-rumped Wheatear Oenanthe moesta | Passeriformes / Muscicapidae | LC |
| Hooded Wheatear Oenanthe monacha | Passeriformes / Muscicapidae | LC |
| Somali Wheatear Oenanthe phillipsi | Passeriformes / Muscicapidae | LC |
| Capped Wheatear Oenanthe pileata | Passeriformes / Muscicapidae | LC |
| Brown-tailed Rock Chat Oenanthe scotocerca | Passeriformes / Muscicapidae | LC |
| Atlas Wheatear Oenanthe seebohmi | Passeriformes / Muscicapidae | LC |
| Kurdish Wheatear Oenanthe xanthoprymna | Passeriformes / Muscicapidae | LC |
| Yellow-eared Parrot Ognorhynchus icterotis | Psittaciformes / Psittacidae | VU |
| Northern Bentbill Oncostoma cinereigulare | Passeriformes / Tyrannidae | LC |
| Southern Bentbill Oncostoma olivaceum | Passeriformes / Tyrannidae | LC |
| Lunulated Antbird Oneillornis lunulatus | Passeriformes / Thamnophilidae | LC |
| White-throated Antbird Oneillornis salvini | Passeriformes / Thamnophilidae | LC |
| White-billed Starling Onychognathus albirostris | Passeriformes / Sturnidae | LC |
| Somali Starling Onychognathus blythii | Passeriformes / Sturnidae | LC |
| Socotra Starling Onychognathus frater | Passeriformes / Sturnidae | LC |
| Chestnut-winged Starling Onychognathus fulgidus | Passeriformes / Sturnidae | LC |
| Red-winged Starling Onychognathus morio | Passeriformes / Sturnidae | LC |
| Pale-winged Starling Onychognathus nabouroup | Passeriformes / Sturnidae | LC |
| Neumann's Starling Onychognathus neumanni | Passeriformes / Sturnidae | LC |
| Bristle-crowned Starling Onychognathus salvadorii | Passeriformes / Sturnidae | LC |
| Slender-billed Starling Onychognathus tenuirostris | Passeriformes / Sturnidae | LC |
| Tristram's Starling Onychognathus tristramii | Passeriformes / Sturnidae | LC |
| Waller's Starling Onychognathus walleri | Passeriformes / Sturnidae | LC |
| Spectacled Tern Onychoprion lunatus | Charadriiformes / Laridae | LC |
| Tropical Royal Flycatcher Onychorhynchus coronatus | Passeriformes / Onychorhynchidae | NE |
| Atlantic Royal Flycatcher Onychorhynchus swainsoni | Passeriformes / Onychorhynchidae | VU |
| Himalayan Quail Ophrysia superciliosa | Galliformes / Phasianidae | CR |
| Hoatzin Opisthocomus hoazin | Opisthocomiformes / Opisthocomidae | LC |
| Mountain Avocetbill Opisthoprora euryptera | Apodiformes / Trochilidae | LC |
| Connecticut Warbler Oporornis agilis | Passeriformes / Parulidae | LC |
| Brown Tanager Orchesticus abeillei | Passeriformes / Thraupidae | NT |
| Tit Berrypecker Oreocharis arfaki | Passeriformes / Paramythiidae | LC |
| Crested Bellbird Oreoica gutturalis | Passeriformes / Oreoicidae | LC |