The Roman Catholic Diocese of Piracicaba () is a diocese located in the city of Piracicaba in the ecclesiastical province of Campinas in Brazil.

History February 26, 1944: Established as Diocese of Piracicaba from Diocese of Campinas

Bishops Bishops of Piracicaba (Roman rite):, in reverse chronological order Bishop Fernando Mason, O.F.M. Conv. (2005.05.25 – present) Bishop Moacyr José Vitti, C.S.S. (2002.05.15 – 2004.05.19), appointed Archbishop of Curitiba, Parana Bishop Eduardo Koaik (1984.01.11 – 2002.05.15) Bishop Aniger de Francisco de Maria Melillo (1960.05.29 – 1984.01.11) Bishop Ernesto de Paula (1945.06.30 – 1960.01.09)

Coadjutor bishop Eduardo Koaik (1979-1984)

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