- Aegolius acadicus (Northern Saw-whet Owl)
- Aegolius acadicus acadicus
- Aegolius acadicus brooksi
- Aegolius funereus (Boreal Owl)
- Aegolius funereus beickianus
- Aegolius funereus caucasicus
- Aegolius funereus funereus
- Aegolius funereus magnus
- Aegolius funereus pallens
- Aegolius funereus richardsoni
- Aegolius harrisii (Buff-fronted Owl)
- Aegolius harrisii dabbenei
- Aegolius harrisii harrisii
- Aegolius harrisii iheringi
- Aegolius ridgwayi (Unspotted Saw-whet Owl)
- Aegolius ridgwayi ridgwayi
- Aegolius ridgwayi rostratus
- Asio abyssinicus (African Long-eared Owl)
- Asio abyssinicus abyssinicus
- Asio abyssinicus graueri
- Asio capensis (Marsh Owl)
- Asio capensis capensis
- Asio capensis hova
- Asio capensis tingitanus
- Asio flammeus (Short-eared Owl)
- Asio flammeus [domingensis Group] (Short-eared Owl (Antillean))
- Asio flammeus bogotensis
- Asio flammeus domingensis
- Asio flammeus flammeus (Short-eared Owl (flammeus))
- Asio flammeus galapagoensis (Short-eared Owl (Galapagos))
- Asio flammeus pallidicaudus
- Asio flammeus ponapensis
- Asio flammeus portoricensis
- Asio flammeus sandwichensis (Short-eared Owl (Hawaiian))
- Asio flammeus sanfordi
- Asio flammeus suinda
- Asio madagascariensis (Madagascar Long-eared Owl)
- Asio otus (Northern Long-eared Owl)
- Asio otus canariensis
- Asio otus otus
- Asio otus tuftsi
- Asio otus wilsonianus
- Asio stygius (Stygian Owl)
- Asio stygius barberoi
- Asio stygius lambi
- Asio stygius noctipetens
- Asio stygius robustus
- Asio stygius siguapa
- Asio stygius stygius
- Athene blewitti (Forest Owlet)
- Athene brama (Spotted Owlet)
- Athene brama albida
- Athene brama brama
- Athene brama indica
- Athene brama pulchra
- Athene cunicularia (Burrowing Owl)
- Athene cunicularia amaura
- Athene cunicularia apurensis
- Athene cunicularia arubensis
- Athene cunicularia boliviana
- Athene cunicularia brachyptera
- Athene cunicularia carrikeri
- Athene cunicularia cunicularia
- Athene cunicularia floridana (Burrowing Owl (Florida))
- Athene cunicularia grallaria
- Athene cunicularia guadeloupensis
- Athene cunicularia guantanamensis
- Athene cunicularia hypugaea (Burrowing Owl (Western))
- Athene cunicularia intermedia
- Athene cunicularia juninensis
- Athene cunicularia minor
- Athene cunicularia nanodes
- Athene cunicularia partridgei
- Athene cunicularia pichinchae
- Athene cunicularia punensis
- Athene cunicularia rostrata
- Athene cunicularia tolimae
- Athene cunicularia troglodytes
- Athene noctua (Little Owl)
- Athene noctua bactriana
- Athene noctua glaux
- Athene noctua impasta
- Athene noctua indigena
- Athene noctua lilith
- Athene noctua ludlowi
- Athene noctua noctua
- Athene noctua orientalis
- Athene noctua plumipes
- Athene noctua somaliensis
- Athene noctua spilogastra
- Athene noctua vidalii
- Bubo africanus (Spotted Eagle-Owl)
- Bubo africanus africanus
- Bubo africanus milesi
- Bubo africanus tanae
- Bubo ascalaphus (Pharaoh Eagle-Owl)
- Bubo ascalaphus ascalaphus
- Bubo ascalaphus desertorum
- Bubo bengalensis (Rock Eagle-Owl)
- Bubo bubo (Eurasian Eagle-Owl)
- Bubo bubo bubo
- Bubo bubo hemachalanus (tibetanus)
- Bubo bubo hispanus
- Bubo bubo interpositus
- Bubo bubo jakutensis
- Bubo bubo nikolskii
- Bubo bubo omissus
- Bubo bubo ruthenus
- Bubo bubo swinhoei
- Bubo capensis (Cape Eagle-Owl)
- Bubo capensis capensis
- Bubo capensis dillonii
- Bubo capensis mackinderi
- Bubo cinerascens (Grayish Eagle-Owl)
- Bubo coromandus (Dusky Eagle-Owl)
- Bubo coromandus coromandus
- Bubo coromandus klossii
- Bubo lacteus (Verreaux’s Eagle-Owl)
- Bubo leucostictus (Akun Eagle-Owl)
- Bubo nipalensis (Spot-bellied Eagle-Owl)
- Bubo nipalensis blighi
- Bubo nipalensis nipalensis
- Bubo philippensis (Philippine Eagle-Owl)
- Bubo philippensis mindanensis
- Bubo philippensis philippensis
- Bubo poensis (Fraser’s Eagle-Owl)
- Bubo scandiacus (Snowy Owl)
- Bubo shelleyi (Shelley’s Eagle-Owl)
- Bubo sumatranus (Barred Eagle-Owl)
- Bubo sumatranus strepitans
- Bubo sumatranus sumatranus
- Bubo virginianus (Great Horned Owl)
- Bubo virginianus [virginianus Group] (Great Horned Owl (Great Horned))
- Bubo virginianus elachistus
- Bubo virginianus heterocnemis
- Bubo virginianus lagophonus
- Bubo virginianus magellanicus (Great Horned Owl (Magellanic))
- Bubo virginianus mayensis
- Bubo virginianus mesembrinus
- Bubo virginianus nacurutu
- Bubo virginianus nigrescens
- Bubo virginianus pacificus
- Bubo virginianus pallescens
- Bubo virginianus saturatus
- Bubo virginianus subarcticus (occidentalis)
- Bubo virginianus virginianus
- Bubo vosseleri (Usambara Eagle-Owl)
- Ciccaba albitarsis (Rufous-banded Owl)
- Ciccaba huhula (Black-banded Owl)
- Ciccaba huhula huhula
- Ciccaba nigrolineata (Black-and-white Owl)
- Ciccaba virgata (Mottled Owl)
- Ciccaba virgata centralis
- Ciccaba virgata macconnelli
- Ciccaba virgata squamulata
- Ciccaba virgata superciliaris
- Ciccaba virgata tamaulipensis
- Glaucidium albertinum (Albertine Owlet)
- Glaucidium bolivianum (Yungas Pygmy-Owl)
- Glaucidium brasilianum (Ferruginous Pygmy-Owl)
- Glaucidium brasilianum brasilianum
- Glaucidium brasilianum cactorum
- Glaucidium brasilianum duidae
- Glaucidium brasilianum margaritae
- Glaucidium brasilianum medianum
- Glaucidium brasilianum olivaceum
- Glaucidium brasilianum pallens
- Glaucidium brasilianum phaloenoides
- Glaucidium brasilianum ridgwayi
- Glaucidium brasilianum saturatum
- Glaucidium brasilianum stranecki
- Glaucidium brasilianum tucumanum (Ferruginous Pygmy-Owl (Tucuman))
- Glaucidium brasilianum ucayalae
- Glaucidium brodiei (Collared Owlet)
- Glaucidium brodiei brodiei
- Glaucidium brodiei pardalotum
- Glaucidium capense (African Barred Owlet)
- Glaucidium capense capense
- Glaucidium capense ngamiense
- Glaucidium capense scheffleri
- Glaucidium castaneum (Chestnut Owlet)
- Glaucidium castaneum castaneum
- Glaucidium castaneum etchecopari
- Glaucidium castanonotum (Chestnut-backed Owlet)
- Glaucidium castanopterum (Javan Owlet)
- Glaucidium costaricanum (Costa Rican Pygmy-Owl)
- Glaucidium cuculoides (Asian Barred Owlet)
- Glaucidium cuculoides cuculoides
- Glaucidium cuculoides deignani
- Glaucidium cuculoides delacouri
- Glaucidium cuculoides rufescens
- Glaucidium cuculoides whitelyi
- Glaucidium gnoma (Northern Pygmy-Owl)
- Glaucidium gnoma [californicum Group] (Northern Pygmy-Owl (Pacific))
- Glaucidium gnoma californicum
- Glaucidium gnoma cobanense (Northern Pygmy-Owl (Guatemalan))
- Glaucidium gnoma gnoma (Northern Pygmy-Owl (Mountain))
- Glaucidium gnoma grinnelli
- Glaucidium gnoma hoskinsii (Northern Pygmy-Owl (Cape))
- Glaucidium gnoma pinicola (Northern Pygmy-Owl (Rocky Mts.))
- Glaucidium gnoma swarthi
- Glaucidium griseiceps (Central American Pygmy-Owl)
- Glaucidium griseiceps griseiceps
- Glaucidium hardyi (Amazonian Pygmy-Owl)
- Glaucidium jardinii (Andean Pygmy-Owl)
- Glaucidium minutissimum (Least Pygmy-Owl)
- Glaucidium mooreorum (Pernambuco Pygmy-Owl)
- Glaucidium nanum (Austral Pygmy-Owl)
- Glaucidium nubicola (Cloud-forest Pygmy-Owl)
- Glaucidium palmarum (Colima Pygmy-Owl)
- Glaucidium palmarum griscomi
- Glaucidium palmarum oberholseri
- Glaucidium palmarum palmarum
- Glaucidium parkeri (Subtropical Pygmy-Owl)
- Glaucidium passerinum (Eurasian Pygmy-Owl)
- Glaucidium passerinum orientale
- Glaucidium passerinum passerinum
- Glaucidium perlatum (Pearl-spotted Owlet)
- Glaucidium perlatum licua
- Glaucidium perlatum perlatum
- Glaucidium peruanum (Peruvian Pygmy-Owl)
- Glaucidium radiatum (Jungle Owlet)
- Glaucidium radiatum malabaricum
- Glaucidium radiatum radiatum
- Glaucidium sanchezi (Tamaulipas Pygmy-Owl)
- Glaucidium siju (Cuban Pygmy-Owl)
- Glaucidium siju siju
- Glaucidium siju vittatum
- Glaucidium sjostedti (Sjostedt’s Owlet)
- Glaucidium tephronotum (Red-chested Owlet)
- Glaucidium tephronotum tephronotum
- Gymnoglaux lawrencii (Bare-legged Owl)
- Gymnoglaux lawrencii exsul
- Gymnoglaux lawrencii lawrencii
- Jubula lettii (Maned Owl)
- Ketupa blakistoni (Blakiston’s Fish-Owl)
- Ketupa blakistoni blakistoni
- Ketupa blakistoni doerriesi
- Ketupa flavipes (Tawny Fish-Owl)
- Ketupa ketupu (Buffy Fish-Owl)
- Ketupa ketupu ketupu
- Ketupa ketupu minor
- Ketupa zeylonensis (Brown Fish-Owl)
- Ketupa zeylonensis leschenaultii
- Ketupa zeylonensis orientalis
- Ketupa zeylonensis semenowi
- Ketupa zeylonensis zeylonensis
- Lophostrix cristata (Crested Owl)
- Lophostrix cristata cristata
- Lophostrix cristata stricklandi
- Megascops albogularis (White-throated Screech-Owl)
- Megascops albogularis aequatorialis
- Megascops albogularis albogularis
- Megascops albogularis obscurus
- Megascops asio (Eastern Screech-Owl)
- Megascops asio [asio Group] (Eastern Screech-Owl (Northern))
- Megascops asio asio
- Megascops asio floridanus
- Megascops asio hasbroucki
- Megascops asio naevius
- Megascops atricapilla (Variable Screech-Owl)
- Megascops barbarus (Bearded Screech-Owl)
- Megascops choliba (Tropical Screech-Owl)
- Megascops choliba duidae
- Megascops choliba margaritae
- Megascops clarkii (Bare-shanked Screech-Owl)
- Megascops colombianus (Colombian Screech-Owl)
- Megascops cooperi (Pacific Screech-Owl)
- Megascops cooperi chiapensis
- Megascops cooperi cooperi
- Megascops cooperi lambi
- Megascops guatemalae (Vermiculated Screech-Owl)
- Megascops guatemalae [guatemalae Group] (Vermiculated Screech-Owl (Guatemalan))
- Megascops guatemalae [napensis Group] (Vermiculated Screech-Owl (Foothill))
- Megascops guatemalae bolivianus
- Megascops guatemalae cassini
- Megascops guatemalae dacrysistactus
- Megascops guatemalae fuscus
- Megascops guatemalae helleri
- Megascops guatemalae napensis
- Megascops guatemalae roraimae (Vermiculated Screech-Owl (Roraima))
- Megascops guatemalae thompsoni
- Megascops guatemalae vermiculatus (Vermiculated Screech-Owl (Vermiculated))
- Megascops hoyi (Hoy’s Screech-Owl)
- Megascops ingens (Rufescent Screech-Owl)
- Megascops ingens ingens (minimus)
- Megascops ingens venezuelanus
- Megascops kennicottii (Western Screech-Owl)
- Megascops kennicottii [kennicottii Group] (Western Screech-Owl (Northern))
- Megascops kennicottii kennicottii (saturatus)
- Megascops kennicottii xantusi
- Megascops kennicottii yumanensis
- Megascops koepckeae (Koepcke’s Screech-Owl)
- Megascops marshalli (Cloud-forest Screech-Owl)
- Megascops nudipes (Puerto Rican Screech-Owl)
- Megascops nudipes newtoni
- Megascops nudipes nudipes
- Megascops petersoni (Cinnamon Screech-Owl)
- Megascops roboratus (West Peruvian Screech-Owl)
- Megascops roboratus pacificus
- Megascops roboratus roboratus
- Megascops sanctaecatarinae (Long-tufted Screech-Owl)
- Megascops seductus (Balsas Screech-Owl)
- Megascops trichopsis (Whiskered Screech-Owl)
- Megascops trichopsis trichopsis
- Megascops watsonii (Tawny-bellied Screech-Owl)
- Megascops watsonii usta
- Megascops watsonii watsonii
- Micrathene whitneyi (Elf Owl)
- Micrathene whitneyi graysoni
- Micrathene whitneyi idonea
- Micrathene whitneyi sanfordi
- Micrathene whitneyi whitneyi
- Mimizuku gurneyi (Mindanao Eagle-Owl)
- Nesasio solomonensis (Fearful Owl)
- Ninox affinis (Andaman Hawk-Owl)
- Ninox boobook (Southern Boobook)
- Ninox boobook boobook
- Ninox boobook cinnamomina
- Ninox boobook fusca
- Ninox boobook lurida
- Ninox boobook ocellata
- Ninox boobook pusilla
- Ninox burhani (Togian Hawk-Owl)
- Ninox connivens (Barking Owl)
- Ninox connivens assimilis
- Ninox connivens connivens
- Ninox ios (Cinnabar Hawk-Owl)
- Ninox jacquinoti (Solomon Hawk-Owl)
- Ninox jacquinoti eichhorni
- Ninox jacquinoti granti
- Ninox jacquinoti jacquinoti
- Ninox jacquinoti malaitae
- Ninox japonica (Northern Boobook)
- Ninox japonica japonica
- Ninox japonica totogo
- Ninox meeki (Manus Hawk-Owl)
- Ninox natalis (Christmas Island Hawk-Owl)
- Ninox novaeseelandiae (Morepork)
- Ninox novaeseelandiae albaria
- Ninox novaeseelandiae leucopsis
- Ninox novaeseelandiae novaeseelandiae
- Ninox novaeseelandiae undulata
- Ninox ochracea (Ochre-bellied Hawk-Owl)
- Ninox odiosa (New Britain Hawk-Owl)
- Ninox philippensis (Philippine Hawk-Owl)
- Ninox philippensis centralis
- Ninox philippensis mindorensis
- Ninox philippensis philippensis
- Ninox philippensis reyi (everetti)
- Ninox philippensis spilocephala
- Ninox philippensis spilonota
- Ninox punctulata (Speckled Hawk-Owl)
- Ninox randi (Chocolate Boobook)
- Ninox rudolfi (Sumba Boobook)
- Ninox rufa (Rufous Owl)
- Ninox rufa humeralis (aruensis)
- Ninox rufa meesi
- Ninox rufa queenslandica
- Ninox rufa rufa
- Ninox scutulata (Brown Hawk-Owl)
- Ninox scutulata borneensis
- Ninox scutulata burmanica
- Ninox scutulata hirsuta
- Ninox scutulata javanensis
- Ninox scutulata lugubris
- Ninox scutulata obscura
- Ninox scutulata palawanensis
- Ninox scutulata scutulata (malaccensis)
- Ninox squamipila (Moluccan Hawk-Owl)
- Ninox squamipila forbesi
- Ninox squamipila hantu
- Ninox squamipila hypogramma
- Ninox squamipila squamipila
- Ninox strenua (Powerful Owl)
- Ninox sumbaensis (Little Sumba Hawk-Owl)
- Ninox superciliaris (White-browed Owl)
- Ninox theomacha (Jungle Hawk-Owl)
- Ninox theomacha hoedtii
- Ninox theomacha theomacha
- Ninox variegata (Bismarck Hawk-Owl)
- Ninox variegata superior
- Ninox variegata variegata
- Otus alfredi (Flores Scops-Owl)
- Otus alius (Nicobar Scops-Owl)
- Otus angelinae (Javan Scops-Owl)
- Otus bakkamoena (Indian Scops-Owl)
- Otus bakkamoena bakkamoena
- Otus bakkamoena gangeticus
- Otus bakkamoena marathae
- Otus bakkamoena plumipes
- Otus balli (Andaman Scops-Owl)
- Otus beccarii (Biak Scops-Owl)
- Otus brookii (Rajah Scops-Owl)
- Otus brookii brookii
- Otus brookii solokensis
- Otus brucei (Pallid Scops-Owl)
- Otus brucei brucei
- Otus brucei exiguus
- Otus brucei obsoletus
- Otus brucei semenowi
- Otus capnodes (Anjouan Scops-Owl)
- Otus collari (Sangihe Scops-Owl)
- Otus elegans (Ryukyu Scops-Owl)
- Otus elegans botelensis
- Otus elegans calayensis
- Otus elegans elegans
- Otus elegans interpositus
- Otus enganensis (Enggano Scops-Owl)
- Otus flammeolus (Flammulated Owl)
- Otus fuliginosus (Palawan Scops-Owl)
- Otus hartlaubi (Sao Tome Scops-Owl)
- Otus icterorhynchus (Sandy Scops-Owl)
- Otus icterorhynchus icterorhynchus
- Otus insularis (Seychelles Scops-Owl)
- Otus ireneae (Sokoke Scops-Owl)
- Otus lempiji (Sunda Scops-Owl)
- Otus lempiji lempiji
- Otus lettia (Collared Scops-Owl)
- Otus lettia erythrocampe
- Otus lettia glabripes
- Otus lettia lettia
- Otus lettia umbratilis
- Otus lettia ussuriensis
- Otus longicornis (Luzon Scops-Owl)
- Otus madagascariensis (Torotoroka Scops-Owl)
- Otus magicus (Moluccan Scops-Owl)
- Otus magicus albiventris
- Otus magicus leucospilus
- Otus magicus magicus
- Otus manadensis (Sulawesi Scops-Owl)
- Otus manadensis manadensis
- Otus manadensis mendeni
- Otus manadensis siaoensis
- Otus manadensis sulaensis
- Otus mantananensis (Mantanani Scops-Owl)
- Otus mantananensis mantananensis
- Otus mayottensis (Mayotte Scops-Owl)
- Otus megalotis (Philippine Scops-Owl)
- Otus megalotis boholensis
- Otus megalotis everetti
- Otus megalotis megalotis
- Otus megalotis nigrorum
- Otus mentawi (Mentawai Scops-Owl)
- Otus mindorensis (Mindoro Scops-Owl)
- Otus mirus (Mindanao Scops-Owl)
- Otus moheliensis (Moheli Scops-Owl)
- Otus pauliani (Comoro Scops-Owl)
- Otus pembaensis (Pemba Scops-Owl)
- Otus rufescens (Reddish Scops-Owl)
- Otus rufescens malayensis
- Otus rufescens rufescens
- Otus rutilus (Malagasy Scops-Owl)
- Otus sagittatus (White-fronted Scops-Owl)
- Otus scops (European Scops-Owl)
- Otus scops cycladum
- Otus scops cyprius
- Otus scops mallorcae
- Otus scops pulchellus
- Otus scops scops
- Otus scops turanicus
- Otus semitorques (Japanese Scops-Owl)
- Otus semitorques pryeri
- Otus semitorques semitorques
- Otus senegalensis (African Scops-Owl)
- Otus senegalensis feae
- Otus senegalensis nivosus
- Otus senegalensis pamelae
- Otus senegalensis senegalensis
- Otus senegalensis socotranus
- Otus silvicola (Wallace’s Scops-Owl)
- Otus spilocephalus (Mountain Scops-Owl)
- Otus spilocephalus hambroecki
- Otus spilocephalus huttoni
- Otus spilocephalus latouchi
- Otus spilocephalus luciae
- Otus spilocephalus siamensis
- Otus spilocephalus spilocephalus
- Otus spilocephalus vandewateri
- Otus spilocephalus vulpes
- Otus sunia (Oriental Scops-Owl)
- Otus sunia japonicus
- Otus sunia leggei
- Otus sunia malayanus
- Otus sunia rufipennis
- Otus sunia stictonotus
- Otus sunia sunia
- Otus thilohoffmanni (Serendib Scops-Owl)
- Otus umbra (Simeulue Scops-Owl)
- Phodilus badius (Oriental Bay-Owl)
- Phodilus badius assimilis
- Phodilus badius badius
- Phodilus badius parvus
- Phodilus badius ripleyi
- Phodilus badius saturatus
- Phodilus prigoginei (Congo Bay-Owl)
- Pseudoscops clamator (Striped Owl)
- Pseudoscops clamator clamator
- Pseudoscops clamator forbesi
- Pseudoscops clamator midas