Oksapmin is a Trans–New Guinea language spoken in Oksapmin Rural LLG, Telefomin District, Sandaun, Papua New Guinea.

The two principal dialects are distinct enough to cause some problems with mutual intelligibility.

Oksapmin has dyadic kinship terms[2] and a body-part counting system that goes up to 27.

[3] Notable ethnographic research by Geoffrey B. Saxe at UC Berkeley has documented the encounter between pre-contact uses of number and its cultural evolution under conditions of monetization and exposure to schooling and the formal economy among the Oksapmin.

Loughnane (2009)[5] and Loughnane and Fedden (2011)[6] conclude that it is related to the Ok languages, though those languages share innovative features not found in Oksapmin.