Endangered
5 species| Photo | English | සිංහල | தமிழ் | Scientific name | IUCN | Endemic |
|---|---|---|---|---|---|---|
| Thwaites’ Skink | — | — | Chalcidoseps thwaitesi | EN | Endemic | |
| Tiger Loach | — | — | Paracanthocobitis urophthalma | EN | Endemic | |
| Toque Macaque | රිළවා | இலங்கைக் குல்லாய்க் குரங்கு | Macaca sinica | EN | Endemic | |
| Two Spot Barb | — | — | Pethia cumingii | EN | Endemic | |
| Two-Legged Nessia | — | — | Nessia bipes | EN | — |
