| ISO 639-3 Reference Names | art-289 |
| Luxembourgish | |
| ISO 639-3 | art-001 | ltz |
| ISO 639-2/T | art-002 | ltz |
| ISO 639-2/B | art-003 | ltz |
| ISO 639-1 | art-004 | lb |
| ISO 639-3 Print Names | art-290 | Letzeburgesch |
| ISO 639-3 Print Names | art-290 | Luxembourgish |
| ISO 639-3 Inverted Names | art-291 | Letzeburgesch |
| ISO 639-3 Inverted Names | art-291 | Luxembourgish |