'Language of Sulu/the Tausūg people') is an Austronesian language spoken in the province of Sulu in the Philippines and in the eastern area of the state of Sabah, Malaysia as well as in the Nunukan Regency, province of North Kalimantan, Indonesia by the Tausūg people.

The term Tausūg (tau Sūg, meaning "people of Sulu") is derived from two words: tau ("person") and Sūg[5] (The transformation of "Sūk", itself the contraction of Sūlūk[6]).

[3] In the past, the language has also been simply referred to using the generic term "Moro".

It is classified by linguists as being a member of the Bisayan languages family, which includes Cebuano and Waray.

It is also spoken in Southern Palawan, Eastern Sabah, Malaysia and in Nunukan Regency, North Kalimantan, Indonesia.

[11] The vowel phonemes have a broad range of allophones:[12] Tausūg has expectedly developed some variations in accent and vocabulary from one area to another, but there are two basic dialects characterized by differences with regard to vowel sounds.

The "Gimbahanun" (literally means people from the farm) speakers, the residents of the out-of-town rural areas, use four vowels: /a/, /i/, /u/ and /ə/,[13] the last vowel representing schwa sound or "obscure u", a retention from Proto-Philippine and Proto-Bisayan.

The "Parianun", the residents of the urban areas, use only three vowel phonemes: /a/, /i/, /u/,;[14] the loss of /ə/ is common in many Bisayan and other Philippine languages.