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CCDB → Gymnosperms → Cupressaceae → Thuja
| Taxon name | Status | Median (n) |
| Thuja koraiensis Nakai | Accepted | 11 |
| Thuja occidentalis L. | Accepted | 11 |
| Thuja plicata Donn ex D. Don | Accepted | 11 |
| Thuja standishii (Gordon) Carrière | Accepted | 11 |
| Thuja sphaeroidalis Rich. & A. Rich. | Synonym of Chamaecyparis thyoides (L.) Britton & Sterns & Poggenb. | 11 |
| Thuja sphaeroidea Spreng. | Synonym of Chamaecyparis thyoides (L.) Britton & Sterns & Poggenb. | 11 |
| Thuja orientalis L. | Synonym of Platycladus orientalis (L.) Franco | 11 |
| Chamaecyparis boursieri Carrière | Synonym of Thuja occidentalis L. | 11 |
| Thuja occidentalis var. compacta Carrière | Synonym of Thuja occidentalis L. | 11 |