The Diocese of Santa Giusta, formerly Othoca, was a Roman Catholic diocese in Santa Giusta, Sardinia. The bishop's seat was in the former Santa Giusta Cathedral, now a minor basilica.
The diocese was established in 1119 and abolished in 1503, when it was absorbed into the Archdiocese of Oristano.
Since 1969 Santa Giusta has been a titular bishopric.
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