---
name: locale-lb-lu
description: Use when working with the Luxembourgish (Luxembourg) locale (`lb-LU`) — its endonym Lëtzebuergesch (Lëtzebuerg), Latin script, left-to-right (LTR) direction, or spoken-population data. Reference data and translation guidance (register, grammar, idiom, typography) for this specific locale; see [[locale]] for general i18n/l10n concepts (BCP 47, plural rules, RTL) that apply across all locales.
---

# Locale: Luxembourgish (Luxembourg) (lb-LU)

Reference data for the **Luxembourgish (Luxembourg)** locale — endonym **Lëtzebuergesch (Lëtzebuerg)**, written in the Latin script, left-to-right (LTR).

## Identifiers

- **BCP 47 tag:** `lb-LU`
- **ISO 639-1:** `lb`
- **ISO 639-3:** `ltz`
- **Script:** Latn (Latin)
- **Region:** LU (Luxembourg)
- **Text direction:** ltr — left-to-right (LTR)

## Speakers (approximate)

- **L1 (native):** 400,000
- **L2 (additional):** 200,000
- **L1+L2 (total):** 600,000

## Base locale

This is a regional variant of [[locale-lb-001]] (Luxembourgish), the base/macro locale for this language.

## Pluralization

CLDR plural categories for this locale: **one**, **other** (2 forms).

- **one** — `n = 1` (e.g. 1)
- **other** — everything else (e.g. 0, 2~16, 100, 1000, …)

See [[unicode-messageformat]] for writing plural messages using these categories.

## Translating into this locale

Apply [[locale-lb-001]] to Luxembourgish in Luxembourg.

- **Trilingual context:** Luxembourgish is the national language, French is the language of legislation, and German is used in the press and school. Official documents appear in French; Luxembourgish is increasingly written in apps and campaigns.
- **Names and institutions:** keep official names (Chamber of Deputies is "Chamber", Government is "Regierung") in the forms used on the government portal.
- **Formats:** euro, day.month.year, 24-hour clock, decimal comma.

## Common pitfalls

- Translating Luxembourgish through French.
- Using German-only spellings.
- The general pitfalls in [[locale-lb-001]] also apply.

## Learn more

- [[locale]] for BCP 47 identifiers, locale-sensitive formatting, pluralization, and text-direction concepts that apply across all locales.
- [[unicode-messageformat]] for writing plural/selection messages correctly for this locale's grammar.
- Lëtzebuerger Online Dictionnaire (LOD, https://lod.lu)