There are two Roman Catholic dioceses named Formosa:

• Roman Catholic Diocese of Formosa, Argentina (Dioecesis Formosae), erected as a diocese in 1957 from the Diocese of Resistencia
• Roman Catholic Diocese of Formosa, Brazil (Dioecesis Formosensis), erected in 1956 from the Archdiocese of Goiás, and elevated to diocese in 1979

See also

• List of Roman Catholic dioceses in Taiwan on the island of Formosa

This disambiguation page lists articles associated with the title Diocese of Formosa.
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