Since 1969 Rubicon has been a titular see of the Roman Catholic Church. It takes its name from the lapsed Diocese of Rubicón in Spain, previously a suffragan in the ecclesiastical province of the Archdiocese of Seville.
| Titular Bishops of Rubicon | |||||
| No. | Name | Office | From | To | |
|---|---|---|---|---|---|
| 1 | Jaime Flores Martin | Bishop emeritus of Barbastro-Monzón (Spain) | 30 April 1970 | 11 December 1970 | |
| 2 | Oskar Saier | Auxiliary bishop in Freiburg (Germany) | 7 April 1972 | 15 March 1978 | |
| 3 | José Sánchez González | Auxiliary bishop in Oviedo (Spain) | 15 January 1980 | 11 September 1991 | |
| 4 | Stanisław Gądecki | Auxiliary bishop in Gniezno (Poland) | 1 February 1992 | 28 March 2002 | |
| 5 | Joaquín Carmelo Borobia Isasa | Auxiliary bishop in Toledo (Spain) | 21 October 2004 | 23 April 2022 | |
| 6 | Tomasz Grysa | Apostolic Nuncio | 27 September 2022 | ||