The Roman Catholic Diocese of Formosa (Latin: Dioecesis Formosensis) is a Latin suffragan diocese in the ecclesiastical province of Brasília in central Brazil.

Its cathedral episcopal see is Catedral Nossa Senhora da Imaculada Conceição, dedicated to Our Lady of the Immaculate Conception, in the city of Formosa, in the state of Goiás, central Brazil.

• Established on March 26, 1956, as the Territorial Prelature of Formosa, on territory split off from the then Archdiocese of Goiás (at the same time demoted to a suffragan itself) and from the suppressed Territorial Prelature of São José de Alto Tocantins
• Promoted on October 16, 1979, as the Diocese of Formosa.

As per 2014, it pastorally serves 256,900 Catholics (73.5% of 349,500 total) on 47,604 km in 27 parishes and 240 missions with 37 priests (diocesan), 52 lay religious (4 brothers, 48 sisters) and 14 seminarians.

(all Roman rite)

Bishop-Prelates of Formosa

• Victor João Herman José Tielbeek, Picpus Fathers (SS.CC.) (February 4, 1961 - October 16, 1979 see below), Titular Bishop of Tipasa in Numidia (1961.02.04 – 1978.05.26), born 1919.08.16 in the Netherlands

Suffragan Bishops of Formosa

• Victor João Herman José Tielbeek, SS.CC. (see above October 16, 1979 - death December 24, 1997)
• João Casimiro Wilk, Conventual Franciscans (O.F.M. Conv.) (January 28, 1998 - June 9, 2006), transferred Bishop of Anápolis (Brazil) (2004.06.09 – ...), born Poland 1951.09.18
• Paulo Roberto Beloto (November 16, 2005 – 2013.10.23), first Brazilian incumbent; transferred Bishop of Franca (Brazil) (2013.10.23 – ...)
• José Ronaldo Ribeiro (2014.09.24 – 2018.09.12), previously Bishop of Janaúba (Brazil) (2007.06.06 – 2014.09.24); retired
• Adair José Guimarães (2019.02.27 -

• Dilmo Franco de Campos, appointed Auxiliary Bishop of Anápolis, Goias in 2019

• List of Catholic dioceses in Brazil
• namesame Roman Catholic Diocese of Formosa, Argentina

• GCatholic.org
• Catholic Hierarchy
• Diocese website (Portuguese) Archived 2006-06-19 at the Wayback Machine

15°32′42″S 47°20′14″W / 15.5451°S 47.3372°W / -15.5451; -47.3372