The Roman Catholic Diocese of Blumenau (Latin: Dioecesis Florumpratensis) is a diocese located in the city of Blumenau in the ecclesiastical province of Joinville in Brazil.

• April 19, 2000: Established as Diocese of Blumenau from the Metropolitan Archdiocese of Florianópolis, Diocese of Joinville and Diocese of Rio do Sul
• November 5, 2024: The diocese became a suffragan see of the newly promoted Archdiocese of Joinville

• Bishops of Blumenau (Roman rite)
  • Bishop Angélico Sândalo Bernardino (April 19, 2000 – February 18, 2009)
  • Bishop Giuseppe Negri, P.I.M.E., (February 18, 2009 – October 29, 2014), appointed Coadjutor Bishop of Santo Amaro, São Paulo
  • Bishop Rafael Biernaski (June 24, 2015 – present)

• GCatholic.org
• Catholic Hierarchy
• Diocese website (Portuguese) Archived 2012-04-02 at the Wayback Machine

26°55′10″S 49°04′00″W / 26.9195°S 49.0668°W / -26.9195; -49.0668