The Roman Catholic Diocese of Ji-Paraná (Latin: Dioecesis Giparanensis) is a diocese located in the city of Ji-Paraná in the ecclesiastical province of Porto Velho in Brazil.

• 3 January 1978: Established as Territorial Prelature of Vila Rondônia from the Territorial Prelature of Guajará-Mirim and Territorial Prelature of Porto Velho
• 19 February 1983: Promoted as Diocese of Ji-Paraná
• 23 December 1997: Lost territory, along with Diocese of Diamantino, to establish Diocese of Juína

• Prelate of Vila Rondônia (Roman Rite)
  • Bishop José Martins da Silva, S.D.N. (1978.01.03 – 1982.10.04), appointed Archbishop of Porto Velho, Rondonia
• Bishops of Ji-Paraná (Roman rite)
  • Bishop Antônio Possamai, S.D.B. (1983.03.04 – 2007.04.11)
  • Bishop Bruno Pedron, S.D.B. (2007.04.11 – 2019.06.05)
  • Bishop Norbert Hans Christoph Foerster, S.V.D. (2020.12.02 – present)

• GCatholic.org
• Catholic Hierarchy
• Diocese website (Portuguese)

10°52′56″S 61°56′41″W / 10.8821°S 61.9448°W / -10.8821; -61.9448