- Saffron Toucanet
- Sand Martin
- Sanderling
- Sandhill Crane
- Sandwich Tern
- Sardinian Warbler
- Savanna Hawk
- Say's Phoebe
- Scaly-breasted Thrasher
- Scaly-naped Pigeon
- Scarlet Flycatcher
- Scarlet Ibis
- Scarlet Macaw
- Sedge Warbler
- Seychelles Blue Pigeon
- Seychelles Bulbul
- Seychelles Fody
- Seychelles Magpie-Robin
- Seychelles Sunbird
- Seychelles Warbler
- Shiny Cowbird
- Short-billed Dowitcher
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Silver-beaked Tanager
- Silver Pheasant
- Silver Teal
- Silvery Grebe
- Slate-throated Whitestart
- Slender-billed Gull
- Smew
- Snail Kite
- Snow Bunting
- Snowy-crowned Tern
- Snowy Egret
- Snowy Owl
- Social Flycatcher
- Solitary Sandpiper
- Song Sparrow
- Song Thrush
- Southern Beardless Tyrannulet
- Southern Cassowary
- Southern House Wren
- Southern Lapwing
- Southern Screamer
- Speckled Pigeon
- Spectacled Thrush
- Spot-winged Pigeon
- Spotted Dove
- Spotted Flycatcher
- Spotted Nothura
- Spotted Redshank
- Spotted Sandpiper
- Spotted Towhee
- Steller's Jay
- Steppe Eagle
- Stock Dove
- Strange-tailed Tyrant
- Striated Heron
- Stripe-crowned Spinetail
- Sulphur-crested Cockatoo
- Superb Starling
- Swainson's Hawk