- Sabota Lark
- Sanderling
- Sardinian Warbler
- Sedge Warbler
- Short-eared Owl
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Slender-billed Gull
- Snow Bunting
- Snow Goose
- Sociable Weaver
- Song Thrush
- Southern Grey-headed Sparrow
- Southern Masked Weaver
- Southern Yellow-billed Hornbill
- Spanish Imperial Eagle
- Spanish Sparrow
- Spike-heeled Lark
- Spotless Starling
- Spotted Flycatcher
- Spotted Redshank
- Squacco Heron
- Stark's Lark
- Steller's Jay
- Striated Heron