- Sacred Kingfisher
- Saddle-billed Stork
- Sand Martin
- Sanderling
- Sandhill Crane
- Sandwich Tern
- Sardinian Warbler
- Savannah Sparrow
- Scaly-breasted Lorikeet
- Scarlet-chested Sunbird
- Scarlet Macaw
- Scopoli's Shearwater
- Secretarybird
- Sedge Warbler
- Semipalmated Plover
- Senegal Thick-knee
- Sharpe's Starling
- Shining Bronze Cuckoo
- Short-billed Dowitcher
- Short-eared Owl
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Siberian Stonechat
- Silver Gull
- Silvereye
- Silvery-cheeked Hornbill
- Slender-billed Gull
- Slender-tailed Nightjar
- Smew
- Snow Bunting
- Snow Goose
- Solitary Sandpiper
- Somali Ostrich
- Song Sparrow
- Song Thrush
- South Island Oystercatcher
- South Island Robin
- South Melanesian Cuckooshrike
- Southern Grey Shrike
- Southern Ground Hornbill
- Southern Yellow-billed Hornbill
- Spanish Imperial Eagle
- Spanish Sparrow
- Speckled Mousebird
- Speckled Pigeon
- Spectacled Warbler
- Spectacled Weaver
- Spot-breasted Lapwing
- Spotless Starling
- Spotted Crake
- Spotted Dove
- Spotted Flycatcher
- Spotted Redshank
- Spotted Sandpiper
- Spotted Shag
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Steppe Eagle
- Stilt Sandpiper
- Streaked Fantail
- Streaky Seedeater
- Striated Heron
- Striated Starling
- Striped Kingfisher
- Subalpine Warbler
- Sulphur-crested Cockatoo
- Superb Starling
- Swainson's Sparrow
- Swainson's Spurfowl
- Swamp Harrier