Yei (Yey, Jei, Je, Yei-Nan) is a Papuan language spoken along the upper reaches of the Maro River, in the Merauke, South Papua, Indonesia. The Upper and Lower Yey dialects are only mutually intelligible with difficulty.
According to Evans (2018), Yei is spoken in the villages of Po, Torai, Bupul, Tanas, and Kwel in , in eastern Merauke Regency, Indonesia.