| Kingdom: | Animalia |
| Phylum: | Chordata |
| Subphylum: | Vertebrata |
| Class: | Aves |
| Superorder: | Neognathae |
| Order: | Strigiformes |
| Family: | Strididae |
- Subfamily
- Genus
- species – Common Name
- Aegolius
- acadicus, funereus, harrisii, ridgwayi – Owl
- Asio
- abyssinicus, capensis, clamator, flammeus, madagascariensis, otus, stygius – Owl
- Athene
- blewitti, brama – Owlet
- cunicularia, noctua – Owl
- Bubo
- africanus, ascalaphus, bengalensis, bubo, capensis, coromandus, lacteus, leucostictus, nipalensis, philippensis, poenis, shelleyi, sumatrana – Eagle Owl
- blakistoni, flavipes, ketapu, zeylonensis – Fish Owl
- virginianus – Great Horned Owl
- Ciccaba
- albitarsus, huhula, nigrolineata, virgata – Owl
- Glaucidium
- albertinum, brodiei, capense, castaneum, castanopterum, cuculoides, perlatum, radiatum, scheffleri, sjostedti, tephronotum – Owlet
- brasilianum, gnoma, jardinii, minutissimum, nanum, passerinum, siju – Pygmy Owl
- Jubula
- lettii – Maned Owl
- Lophostrix
- cristata – Crested Owl
- Micrathene
- whitneyi – Elf Owl
- Mimizuku
- gurneyi – Giant Scops Owl
- Nesasio
- solomonensis – Fearful Owl
- Ninox
- affinis, jacquinoti, meeki, ochracea, odiosa, philippensis, punctulata, rufa, scutulata, spilocephala, spilonota, squamipila, superciliaris, theomacha, variegata – Hawk-Owl
- connivens, novaeseelandiae, rudolfi, strenua – Owl
- Nyctea
- scandiaca – Snowy Owl
- Otus
- albogularis, asio, atricapillus, barbarus, choliba, clarkii, columbianus, cooperii, guatemalae, ingens, kennicotti, koepckeae, lawrencii, marshalli, nudipes, peterseni, roboratus, sanctaecatarinae, seductus, trichopsis, watsoni – Screech Owl
- alfredi, angelinae, bakkamoena, balli, beccarii, brookii, brucei, elegans, fuliginosus, hartlaubi, icterorhynchus, insularis, ireneae, lempiji, leucotis, longicornis, magicus, manadensis, mantananensis, megalotis, mentawi, mindorensis, mirus, pembaensis, podarginus, rufescens, rutilus, sagittatus, scops, senegalensis, silvicola, spilocephalus, sunis, umbra – Scops Owl
- flammeolus – Flammulated Owl
- Pseudoscops
- grammacus – Jamaican Owl
- Pulsatrix
- koeniswaldiana, melanota, perspicillata – Owl
- Sceloglaux
- albifacies – White-faced Owl
- Scotopelia
- bouvieri, peli, ussheri – Fishing Owl
- Strix
- aluco, butleri, fulvescens, hylophila, nebulosa, occidentalis, rufipes, uralensis, varia – Owl
- leptogrammica, ocellata, seloputo, woodfordi – Wood Owl
- Surnia
- ulula – Hawk Owl
- Uroglaux
- dimorpha – Papuan Hawk-Owl
- Xenoglaux
- loweryi – Long-whiskered Owlet
Buboninae
