Kawaimina is a syllabic abbreviation used to refer to four languages and dialects of East Timor, specifically Kairui-Midiki, Waimaha, and Naueti, spoken by one or two thousand speakers each. It is a name used by linguists discussing the languages, not the speakers themselves. The first three, which may be co-dialects, are spoken in adjacent areas in the western part of Baucau District, along the north coast. Naueti is used on the south coast of far western Lautém District, surrounded by speakers of Makasae. Some Midiki speakers near Ossu refer to their language as Osomoko.
The Kawaimina languages are members of the Timor languages. While structurally the languages are Malayo-Polynesian, their vocabulary, particularly that of Naueti, derives mostly from Papuan languages. In this they are similar to Makasae and Habun; none of these languages are easy to classify as either Austronesian or Papuan. The languages are noted for both archaisms and unusual innovations, including vowel harmony and aspirated and post-glottalized consonants in their sound-systems.