The Diocese of Romblon () is a Latin Catholic diocese of the Catholic Church in the Philippines. A constituent of the Latin Church, it is a suffragan of the Archdiocese of Capiz. Its titular patron is St. Joseph, spouse of the Blessed Virgin Mary, and its secondary patron is the Santo Niño. Erected in 1974, the diocese has experienced no jurisdictional changes in that time.
The diocese is divided into six vicariates and has twenty-four parishes, ministered by thirty priests and one religious brother of the Society of the Divine Word (SVD). It covers a land area of and has a population of 227,621 of which 87 per cent are Catholics.