- Saddle-billed Stork
- Saffron Finch
- Sand Martin
- Sanderling
- Sandhill Crane
- Sandwich Tern
- Sardinian Warbler
- Sarus Crane
- Saunders's Tern
- Savannah Sparrow
- Scaled Dove
- Scaly-breasted Munia
- Scaly-breasted Thrasher
- Scaly-naped Pigeon
- Scarlet-backed Flowerpecker
- Scarlet Ibis
- Scarlet Macaw
- Scopoli's Shearwater
- Semipalmated Plover
- Semipalmated Sandpiper
- Senegal Coucal
- Seychelles Blue Pigeon
- Seychelles Bulbul
- Seychelles Kestrel
- Seychelles Paradise Flycatcher
- Seychelles Sunbird
- Shiny Cowbird
- Shoebill
- Short-billed Dowitcher
- Short-eared Owl
- Short-tailed Hawk
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Shy Albatross
- Silver Pheasant
- Silvereye
- Slender-billed Gull
- Slender-billed Kite
- Small Pratincole
- Smooth-billed Ani
- Snail Kite
- Snow Bunting
- Snow Goose
- Snowy-crowned Robin-Chat
- Snowy Egret
- Social Flycatcher
- Socotra Cormorant
- Solitary Sandpiper
- Song Sparrow
- Song Thrush
- Sooty-headed Bulbul
- Sooty Gull
- Sooty Shearwater
- Sooty Tern
- Souimanga Sunbird
- Souimanga Sunbird (abbotti)
- South African Shelduck
- Southern Beardless Tyrannulet
- Southern Black Flycatcher
- Southern Cassowary
- Southern Fiscal
- Southern Grey-headed Sparrow
- Southern Ground Hornbill
- Southern House Wren
- Southern Lapwing
- Southern Masked Weaver
- Southern Red Bishop
- Spanish Sparrow
- Speckled Mousebird
- Speckled Pigeon
- Spectacled Owl
- Spectacled Tern
- Spectacled Thrush
- Splendid Sunbird
- Spot-billed Pelican
- Spotless Starling
- Spotted Dove
- Spotted Eagle-Owl
- Spotted Flycatcher
- Spotted Redshank
- Spotted Sandpiper
- Spotted Thick-knee
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Stilt Sandpiper
- Stolid Flycatcher
- Stork-billed Kingfisher
- Straw-headed Bulbul
- Streak-eared Bulbul
- Streaked Flycatcher
- Striated Grassbird
- Striated Heron
- Striped Kingfisher
- Sun Parakeet
- Sunda Cuckoo
- Sunda Zebra Finch
- Swainson's Spurfowl
- Swamp Harrier
- Swan Goose
- Swinhoe's Snipe
- Swinhoe's White-eye
- Syrian Woodpecker