- Sacred Kingfisher
- Salvin's Albatross
- Sanderling
- Sandwich Tern
- Scaly-breasted Munia
- Scarlet-backed Flowerpecker
- Sedge Warbler
- Sharp-tailed Sandpiper
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Silver Gull (scopulinus)
- Silvereye
- Snow Goose
- Snowy Albatross
- Song Thrush
- South Island Oystercatcher
- South Island Robin
- South Island Takahe
- Southern Brown Kiwi
- Spotted Dove
- Spotted Redshank
- Stitchbird
- Streak-eared Bulbul
- Swamp Harrier