Sepik Iwam, or Yawenian, is a language of Papua New Guinea. It is the lexical basis of the Hauna trade pidgin.
It is spoken in villages such as Iniok () in Tunap/Hunstein Rural LLG of East Sepik Province.
Sepik Iwam pronouns:
Sepik Iwam subject agreement suffixes are:
The structure of this subject agreement paradigm can be traced back to Proto-Sepik, although the morphemes themselves do not seem to be directly related to the reconstructed Proto-Sepik forms. (See also Sepik languages#Gender.)
Like May River Iwam, Sepik Iwam has periodic tense, for instance the matutinal -iyakwok.