- Sabine's Gull
- Saffron-billed Sparrow
- Salvadori's Pheasant
- Salvin's Curassow
- Samoan Woodhen
- Sangihe Hanging Parrot
- Scarlet-thighed Dacnis
- Scheepmaker's Crowned Pigeon
- Scimitar-winged Piha
- Sclater's Monal
- Semiplumbeous Hawk
- Silver-capped Fruit Dove
- Slate-colored Solitaire
- Slaty-breasted Tinamou
- Slaty Egret
- Slaty Tanager
- Slender-billed Flufftail
- Snowy-throated Kingbird
- Socotra Golden-winged Grosbeak
- Solitary Tinamou
- Sooty Ant Tanager
- Sooty Gull
- Southern Chestnut-breasted Wren
- Southern Rockhopper Penguin
- Southern Shrikebill
- Speckle-chested Piculet
- Speckled Mourner
- Speckled Spinetail
- Spix's Macaw
- Splendid Starling
- Spot-bellied Eagle-Owl
- Spot-tailed Nightjar
- Spotted Jewel-babbler
- Sri Lanka Frogmouth
- Sri Lanka Whistling Thrush
- Straw-backed Tanager
- Streak-backed Antshrike
- Streak-backed Canastero
- Streak-throated Barwing
- Strong-billed Woodcreeper
- Sulawesi Cicadabird
- Sulawesi Cuckoo
- Sulawesi Hornbill
- Sunda Frogmouth
- Sunda Teal
- Swinhoe's Storm Petrel