Western Torres Strait Islander Sign Language

Kalaw Lagaw Ya
Western Torres Strait
Mabuiag
Region	Western and Central Torres Strait Islands, Queensland
Ethnicity	Torres Strait Islanders
Native speakers	700 (2005) to 1,200 (2006 census)
Language family	Pama–Nyungan Kalaw Lagaw Ya
Dialects	Kalaw Lagaw Ya Kalaw Kawaw Ya Kulkalgau Ya Kaiwaligau Ya
Signed forms	Western Torres Strait Islander Sign Language
Language codes
ISO 639-3
Glottolog	kala1377
AIATSIS	Y1
Range of Kalaw Lagaw Ya (orange) in the Torres Strait
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Kalaw Lagaw Ya, Kala Lagaw Ya /kalau lagau ja/, or the Western Torres Strait language (also several other names, see below), is the language indigenous to the central and western Torres Strait Islands, Queensland, Australia. On some islands it has now largely been replaced by Torres Strait Creole.

Before colonisation in the 1870s–1880s, it was the major lingua franca of the area in both Australia and Papua New Guinea, and is still widely spoken by neighbouring Papuans and by some Aboriginal people. How many second (or nth) language speakers it has is unknown. It also has a 'light' (simplified/foreigner) form, as well as a pidginised form. The simplified form is fairly prevalent on Badu and neighbouring Moa, particularly among younger people.

The language is known by several names besides Kalaw Lagaw Ya, most of which (including Kalaw Lagaw Ya), are names of dialects, spelling variants, dialect variants, and the like — and include translations of the English terms, Western Island Language and Central Island Language. The following list includes the most common:

One term used by Eastern islanders and neighbouring Papuans for Kala Lagaw Ya is Yagar Yagar, from the word yagar (yá 'speech, etc.' + gár 'sympathy clitic' ('dear', 'please', etc.), often used by Western and Central Islanders in speech to show a sympathetic or nostalgic frame of mind.

In literature on the language the abbreviations KLY (Kalaw Lagaw Ya), KKY (Kalau Kawau Ya), KulY (Kulkalgau Ya), MY (Muwalgau Ya) and KY (Kaiwaligau Ya) are often used as abbreviations. According to Ober (2007), the preferred term in English is Kala Lagaw Ya. The name Mabuiag /mabujaɡ/, in English pronounced /ˈmoʊbiæɡ/ (a European mispronunciation), is fairly widespread as a name for the language, this having been established by the Cambridge Expedition to Torres Strait, whose main research on the language was with Mabuiag material. In a High Court decision on 7 August 2013, the decision was taken to officially term the language Kalau Lagau Ya.