The Seko languages are a group of four closely related Austronesian languages spoken in West Sulawesi and South Sulawesi provinces, Indonesia. They make up a primary branch of the South Sulawesi subgroup.Friberg, T. and T.V. Laskowske (1989). "South Sulawesi languages". In: J.N. Sneddon (ed.), Studies in Sulawesi linguistics part 1, pp. 1-17. Jakarta: Badan Penyelenggara Seri Nusa. The languages of the Seko branch are: Seko Padang, Seko Tengah, Panasuan and Budong-Budong.Laskowske, Thomas. (2006). The Seko languages of South Sulawesi: a reconstruction. Paper presented at the Tenth International Conference on Austronesian Linguistics (10-ICAL), 17–20 January 2006, Palawan, Philippines.
The Badaic languages (namely Bada, Besoa, and Napu) are classified by Zobel (2020) with the Seko languages as part of a Seko–Badaic group within the South Sulawesi branch.
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