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L
| Language name | Native name | Code |
|---|---|---|
| Ladino | ג'ודיאו-איספאנייול | LAD |
| Lahnda | ਲਹਿੰਦੀ | LAH |
| Lamba | - | LAM |
| Land Dayak languages | - | DAY |
| Lao | ພາສາລາວ | LAO |
| Latin | Latine, Lingua Latina | LAT |
| Latvian | Latviešu Valoda | LAV |
| Lezghian | Лезги Чӏал | LEZ |
| Limburgan; Limburger; Limburgish | Limburgs | LIM |
| Lingala | Lingala | LIN |
| Lithuanian | Lietuvių Kalba | LIT |
| Lojban | Lojban | JBO |
| Low German; Low Saxon; German, Low; Saxon, Low | Nederdüütsch, Plattdüütsch | NDS |
| Lower Sorbian | Dolnoserbski | DSB |
| Lozi | Silozi | LOZ |
| Luba-Katanga | - | LUB |
| Luba-Lulua | Lwaà: | LUA |
| Luiseno | - | LUI |
| Lule Sami | Sámegiella | SMJ |
| Lunda | Chilunda | LUN |
| Luo | Dholuo | LUO |
| Lushai | - | LUS |
| Luxembourgish; Letzeburgesch | Lëtzebuergesch | LTZ |