| ISO 639-2/T | art-002 |
| ton | |
| ISO 639-3 | art-001 | ton |
| ISO 639-2/B | art-003 | ton |
| ISO 639-1 | art-004 | to |
| ISO 639-3 Reference Names | art-289 | Tonga (Tonga Islands) |
| ISO 639-3 Print Names | art-290 | Tonga (Tonga Islands) |
| ISO 639-3 Inverted Names | art-291 | Tonga (Tonga Islands) |