The Diocese of Wabag is a Latin Catholic suffragan diocese of the Archdiocese of Mount Hagen. It was erected in 1982.
Bishops
Ordinaries
- Hermann Raich, S.V.D. (1982–2008)
- Arnold Orowae (2008–2024)
- Justin Ain Soongie (2025–present)
Coadjutor bishop
- Arnold Orowae (2004–2008)
Auxiliary bishop
- Arnold Orowae (1999–2004), appointed Coadjutor here
- Justin Ain Soongie (2021–2025), appointed Bishop here