The Roman Catholic Diocese of Basankusu (Latin: Basankusuen(sis)) is a Latin suffragan diocese in the ecclesiastical province of the Metropolitan Mbandaka-Bikoro in the Democratic Republic of the Congo.

Its cathedral episcopal see is Cathédrale Saints-Pierre-et-Paul (Saints Peter and Paul) in the town of Basankusu.

(all Latin Rite, mostly -initially missionary- members of Latin congregations)