- Saddle-billed Stork
- Salvin's Albatross
- Satin Bowerbird
- Scarlet-chested Sunbird
- Scarlet Ibis
- Scarlet Macaw
- Scintillant Hummingbird
- Secretarybird
- Semipalmated Plover
- Senegal Coucal
- Senegal Thick-knee
- Sharp-beaked Ground Finch
- Sharp-tailed Sandpiper
- Shelley's Francolin
- Shy Albatross
- Silver-throated Tanager
- Silver Gull
- Silver Gull (scopulinus)
- Silvery-cheeked Hornbill
- Singing Honeyeater
- Slate-colored Boubou
- Slate-colored Hawk
- Slaty Flowerpiercer
- Slender-billed Prion
- Small Ground Finch
- Social Flycatcher
- Sokoke Scops Owl
- Sooty Chat
- Sooty Gull
- South American Snipe
- South Island Robin
- Southern Cassowary
- Southern Fiscal
- Southern Fulmar
- Southern Giant Petrel
- Southern Ground Hornbill
- Southern Lapwing
- Southern Mealy Amazon
- Southern Red-billed Hornbill
- Southern Rockhopper Penguin
- Southern White-faced Owl
- Southern Yellow-billed Hornbill
- Speckled Mousebird
- Speckled Pigeon
- Speckled Tanager
- Spectacled Weaver
- Splendid Fairywren
- Spot-flanked Barbet
- Spotted Flycatcher
- Spruce Grouse
- Spur-winged Goose
- Spur-winged Lapwing
- Squacco Heron
- Steppe Eagle
- Streaky Seedeater
- Striated Heron
- Striped Honeyeater
- Sulphur-crested Cockatoo
- Summer Tanager
- Superb Fairywren
- Superb Starling
- Swallow-tailed Bee-eater
- Swallow-tailed Gull
- Swamp Flycatcher
- Swamp Harrier