The Diocese of Segorbe-Castellón (Latin: Dioecesis Segobricensis-Castillionensis; Valencian: Diòcesi de Sogorb-Castelló) is a Latin Church diocese of the Catholic Church located in north-eastern Spain, in the province of Castellón, part of the autonomous community of Valencia.

[1] In 1172 Pedro Ruiz de Azagra, second son of the Lord of Estella, held the city of Albarracín, and succeeded in establishing there a bishop.

[3] This choice of name follows the ideology of the Reconquest, according to which the bishops were simply restoring the old Christian entities only temporarily taken over by the Moors.

The Bishop of Valencia, Arnau of Peralta, entered the church of Segorbe by force and expelled the prelate.

Following the De mutatione finium Dioecesium Valentinae-Segorbicensis-Dertotensis decree, of 31 May 1960, the parishes belonging to the Province of València were dismembered and aggregated to the Archdiocese of Valencia.