- Sabine's Gull
- Sacred Kingfisher
- Sahul Sunbird
- Saker Falcon
- Sand Partridge
- Sanderling
- Sandhill Crane
- Sandwich Tern
- Sardinian Warbler
- Saunders's Gull
- Savannah Sparrow
- Saxaul Sparrow
- Scaly-breasted Lorikeet
- Scopoli's Shearwater
- Sedge Warbler
- Semicollared Flycatcher
- Semipalmated Plover
- Semipalmated Sandpiper
- Sharp-tailed Sandpiper
- Shining Flycatcher
- Shining Sunbird
- Short-billed Dowitcher
- Short-eared Owl
- Short-toed Treecreeper
- Siberian Long-tailed Rosefinch
- Siberian Rubythroat (beicki)
- Siberian Sand Plover
- Siberian Stonechat
- Silver Gull
- Silvereye
- Singing Bush Lark
- Slaty-backed Gull
- Slender-billed Gull
- Smew
- Snow Bunting
- Snowy Egret
- Snowy Plover
- Solitary Sandpiper
- Song Sparrow
- Song Thrush
- Sooty Gull
- Sooty Oystercatcher
- Sooty Tern
- Sora
- Southern Cassowary
- Spectacled Warbler
- Spinifex Pigeon
- Spotless Starling
- Spotted Crake
- Spotted Flycatcher
- Spotted Redshank
- Spotted Sandpiper
- Spotted Thick-knee
- Squacco Heron
- Squatter Pigeon
- Steller's Eider
- Steller's Jay
- Steller's Sea Eagle
- Steppe Eagle
- Stilt Sandpiper
- Stock Dove
- Straw-necked Ibis
- Striated Heron
- Striolated Bunting
- Stripe-headed Sparrow
- Sulphur-crested Cockatoo
- Summer Tanager
- Sunda Zebra Finch
- Surf Scoter
- Sykes's Warbler
- Syrian Serin