|Location||Central Sulawesi, Indonesia|
|Primary outflows||Poso River|
|Surface area||323.2 km²|
|Max. depth||450 m|
|Water volume||216 gigalitre|
|Surface elevation||485 m|
Lake Poso (Indonesian: Danau Poso) is a lake in Central Sulawesi, Indonesia, and the third-deepest lake in Indonesia. The lake contains various fish, including the eel Anguilla marmorata which migrates between the lake and the sea, and 11 fish species that are endemic to the lake, notably Adrianichthys, Mugilogobius amadi, M. sarasinorum, Nomorhamphus celebensis, Oryzias nebulosus, O. nigrimas, and O. orthognathus, which are all highly threatened (in some cases possibly already extinct). There is also a large number of endemic Tylomelania freshwater snails in the lake, as well as several endemic Caridina shrimps and Parathelphusid crabs (genera Migmathelphusa, Parathelphusa and Sundathelphusa).
The town of Pendolo is situated at the southern end of the lake, the town of Tentena is located at the northern end, while a number of smaller villages dot the shoreline. The lake drains into the Poso River at Tentena, which flows into the Molucca Sea at the town of Poso. A park containing wild orchids is located near the village Bancea on the lake. As well the forests surrounding the lake still provide rare sightings of the anoa (dwarf buffalo) and the babirusa (literally, pigdeer), a ruminant pig. These two endangered species are among a number of wildlife species found only on the island of Sulawesi.
- Haryani, G.S., and P.E. Hehanussa (2000). Preliminary study of eel fish in Lake Poso, Sulawesi Island, Indonesia. Rep. Suwa Hydrobiol. Sta., Shinshu Univ., 12: 75-80
- Kottelat, M. (1990). Synopsis of the endangered buntingi (Osteichthyes: Adrianichthyidae and Oryziidae) of Lake Poso, Central Sulawesi, Indonesia, with a new reproductive guild and descriptions of three new species. Ichthyological Exploration of Freshwaters 1: 49-67
- Parenti, L.R., and B. Soeroto (2004). Adrianichthys roseni & Oryzias nebulosus, 2 new ricefishes (Adrianichthyidae) from Lake Poso, Sulawesi, Indonesia. Ichthyological Research 51(1): 10-19
- von Rintelen , T., K. von Rintelen, and M. Glaubrecht (2010). The species flock of the viviparous freshwater gastropod Tylomelania (Mollusca: Cerithioidea: Pachychilidae) in the ancient lakes of Sulawesi, Indonesia: the role of geography, trophic morphology and colour as driving forces in adaptive radiation. pp. 485-512 in: Glaubrecht, M., and H. Schneider, eds. (2010). Evolution in Action: Adaptive Radiations and the Origins of Biodiversity. Springer Verlag, Heidelberg, Germany.
- von Rintelen, K., and Y. Cai (2009). Radiation of endemic species flocks in ancient lakes: systematic revision of the freshwater shrimp Caridina H. Milne Edwards, 1837 (Crustacea: Decapoda: Atyidae) from the ancient lakes Of Sulawesi, Indonesia, with the description of eight new species. Raffles Bulletin of Zoology 57: 343-452.
- Chia, O.C.K. and P.K.L. Ng (2006). The freshwater crabs of Sulawesi, with descriptions of two new genera and four new species (Crustacea: Decapoda: Brachyura: Parathelphusidae). Raffles Bulletin of Zoology 54: 381–428.