- Sacred Kingfisher
- Saddle-billed Stork
- Saffron-billed Sparrow
- Saffron Finch
- Saffron Toucanet
- Sakalava Weaver
- Salvin's Albatross
- Sanderling
- Sandwich Tern
- Sapphire-spangled Emerald
- Sapphire-throated Hummingbird
- Sapphire-vented Puffleg
- Sardinian Warbler
- Satin Bowerbird
- Savanna Hawk
- Savanna Nightjar
- Saw-billed Hermit
- Sayaca Tanager
- Scaled Dove
- Scaled Pigeon
- Scaly-breasted Munia
- Scaly-headed Parrot
- Scaly Chatterer
- Scaly Spurfowl
- Scarlet-backed Flowerpecker
- Scarlet-bellied Mountain Tanager
- Scarlet-breasted Dacnis
- Scarlet-browed Tanager
- Scarlet-chested Sunbird
- Scarlet-hooded Barbet
- Scarlet-rumped Cacique
- Scarlet-rumped Tanager
- Scarlet-thighed Dacnis
- Scarlet Flycatcher
- Scarlet Macaw
- Scarlet Minivet
- Scarlet Robin
- Schalow's Turaco
- Schlegel's Asity
- Scintillant Hummingbird
- Screaming Piha
- Scrub Blackbird
- Scrubtit
- Secretarybird
- Semipalmated Plover
- Semipalmated Sandpiper
- Senegal Coucal
- Senegal Thick-knee
- Sentinel Lark
- Serendib Scops Owl
- Serra do Mar Bristle Tyrant
- Sharp-tailed Grass Tyrant
- Shikra
- Shining Sunbeam
- Shiny Cowbird
- Shoebill
- Short-billed Minivet
- Short-crested Flycatcher
- Short-eared Owl
- Short-tailed Hawk
- Short-tailed Paradigalla
- Siamese Pied Myna
- Siberian Sand Plover
- Sickle-billed Vanga
- Sierran Elaenia
- Silver-beaked Tanager
- Silver-breasted Broadbill
- Silver-eared Laughingthrush
- Silver-eared Mesia
- Silver-throated Tanager
- Silver Gull
- Silverbird
- Silvered Antbird
- Silvereye
- Silvery-cheeked Hornbill
- Silvery Grebe
- Singing Honeyeater
- Sirkeer Malkoha
- Slate-colored Boubou
- Slate-colored Grosbeak
- Slate-colored Hawk
- Slate-throated Gnatcatcher
- Slate-throated Whitestart
- Slaty-backed Forest Falcon
- Slaty-tailed Trogon
- Slaty Antwren
- Slaty Brushfinch
- Slaty Flowerpiercer
- Slaty Robin
- Slaty Spinetail
- Slender-billed Oriole
- Slender-billed Weaver
- Slender-tailed Nightjar
- Small-billed Tinamou
- Small Ground Finch
- Small Minivet
- Smew
- Smoke-colored Pewee
- Smooth-billed Ani
- Snail Kite
- Snow-capped Manakin
- Snowy-bellied Hummingbird
- Snowy-crowned Robin-Chat
- Snowy Egret
- Social Flycatcher
- Somali Bunting
- Song Thrush
- Sooty-capped Chlorospingus
- Sooty-headed Bulbul
- Sooty-headed Tyrannulet
- Sooty Chat
- Sooty Oystercatcher
- Souimanga Sunbird
- Southern Bentbill
- Southern Black Flycatcher
- Southern Cassowary
- Southern Citril
- Southern Ground Hornbill
- Southern House Wren
- Southern Lapwing
- Southern Pochard
- Southern Red-billed Hornbill
- Southern Red Bishop
- Southern Rough-winged Swallow
- Southern Screamer
- Spanish Sparrow
- Sparkling Violetear
- Speckle-breasted Wren
- Speckle-fronted Weaver
- Speckled Chachalaca
- Speckled Hummingbird
- Speckled Mousebird
- Speckled Pigeon
- Spectacled Barwing
- Spectacled Owl
- Spectacled Thrush
- Spectacled Weaver
- Spectacled Whitestart
- Speke's Weaver
- Spix's Guan
- Spix's Spinetail
- Splendid Fairywren
- Spot-backed Antbird
- Spot-bellied Eagle-Owl
- Spot-billed Pelican
- Spot-billed Toucanet
- Spot-breasted Antvireo
- Spot-throated Babbler
- Spotted Antbird
- Spotted Crake
- Spotted Dove
- Spotted Flycatcher
- Spotted Owlet
- Spotted Palm Thrush
- Spotted Pardalote
- Spotted Redshank
- Spotted Sandpiper
- Spotted Tanager
- Spotted Thick-knee
- Spotted Tody-Flycatcher
- Spotted Woodcreeper
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Square-tailed Bulbul
- Square-tailed Nightjar
- Squirrel Cuckoo
- Sri Lanka Green Pigeon
- Sri Lanka Grey Hornbill
- Sri Lanka Hanging Parrot
- Sri Lanka Junglefowl
- Sri Lanka White-eye
- Sri Lanka Wood Pigeon
- Stella's Lorikeet
- Stork-billed Kingfisher
- Stout-billed Cinclodes
- Straight-billed Woodcreeper
- Straw-necked Ibis
- Streak-chested Antpitta
- Streak-eared Bulbul
- Streak-headed Woodcreeper
- Streak-throated Woodpecker
- Streaked Dacnis
- Streaked Flycatcher
- Streaked Spiderhunter
- Streaked Tuftedcheek
- Streaky Seedeater
- Streamer-tailed Tyrant
- Striated Bulbul
- Striated Grassbird
- Striated Heron
- Striated Pardalote
- Stripe-breasted Wren
- Stripe-throated Bulbul
- Striped Cuckoo
- Striped Kingfisher
- Strong-billed Honeyeater
- Stygian Owl
- Subdesert Brush Warbler
- Subdesert Mesite
- Sulphur-crested Cockatoo
- Sulphur-winged Parakeet
- Sulphury Flycatcher
- Sultan Tit
- Sunbittern
- Sunda Zebra Finch
- Sungrebe
- Superb Fairywren
- Superb Lyrebird
- Superb Starling
- Superciliaried Hemispingus
- Superciliated Wren
- Surucua Trogon
- Swallow-tailed Gull
- Swallow-tailed Hummingbird
- Swallow-tailed Kite
- Swallow-winged Puffbird
- Swallow Tanager
- Swamp Flycatcher
- Swamp Harrier
- Sword-billed Hummingbird