| Bishops |
 Bishop Luigi Oldani
| Born: | 1905.09.29 (Italy) | | Ordained Priest: | 1928.06.02 | | Consecrated Bishop: | 1961.12.07 | | Died: | 1976.08.05 († 70) |
| Titular Bishop of Gergis (1961.10.31 – 1976.08.05) Auxiliary Bishop of Milano (Italy) (1961.10.31 – 1976.08.05) |
|
 Bishop Józef Olechowski
| Born: | 1735.04.28 | | Ordained Priest: | 1760.03.22 | | Consecrated Bishop: | 1786.07.16 | | Died: | 1809.01.18 († 73) |
| Titular Bishop of Verinopolis (1786.04.03 – 1809.01.18) Auxiliary Bishop of Kraków (Poland) (1786.04.03 – 1809.01.18) |
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 Bishop Józef Michał Ignacy Franciszek Olędzki, Sch. P.
| Born: | 1733.10.08 | | Ordained Priest: | 1757.08.10 | | Consecrated Bishop: | 1763.02.28 | | Died: | 1803 († 70) |
| Auxiliary Bishop of Kyiv–Černihiv (Ukraine) (1763.01.24 – 1781) Titular Bishop of Cambysopolis (1763.01.24 – 1803) |
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Archbishop Marian Oles | Born: | 1934.12.08 (Poland) | | Ordained Priest: | 1961.07.09 | | Consecrated Bishop: | 1988.01.06 | | Died: | 2005.05.24 († 70) |
| Priest of Łomża (Poland) (1961.07.09 – 1987.11.28) Chaplain of His Holiness (1967.07.11 – 1983.06.10) Prelate of Honour of His Holiness (1983.06.10 – 1987.11.28) Apostolic Pro-Nuncio to Kuwait (1987.11.28 – 1991) Apostolic Pro-Nuncio to Iraq (1987.11.28 – 1994.04.09) Titular Archbishop of Ratiaria (1987.11.28 – 2005.05.24) Apostolic Nuncio to Kazakhstan (1994.04.09 – 2001.12.11) Apostolic Nuncio to Kyrgyzstan (1994.04.09 – 2001.12.11) Apostolic Nuncio to Uzbekistan (1994.04.09 – 2001.12.11) Apostolic Nuncio to Tajikistan (1996.12.28 – 2001.12.11) Apostolic Nuncio to Macedonia (2001.12.11 – 2002.05.01) Apostolic Nuncio to Slovenia (2001.12.11 – 2002.05.01) |
|
 Bishop Francisco Olivares Maldonado, O.E.S.A.
| Born: | 1546 (Spain) | | Died: | 1632 († 86) |
| Auxiliary Bishop of Toledo (Spain) (1626.09.07 – 1632) |
|
  Bishop José Otacio Oliveira Guedes (50)
Titular Bishop of Severiana
Auxiliary Bishop of Belo Horizonte (Brazil)
Adjutores gaudi vestri | Born: | 1974.02.26 (São Sebastião do Maranhão, MG, Brazil) | | Ordained Priest: | 2000.08.29 | | Consecrated Bishop: | 2024.08.10 |
| Priest of Niterói (Brazil) (2000.08.29 – 2024.05.15) Titular Bishop of Severiana (2024.05.15 – ...) Auxiliary Bishop of Belo Horizonte (Brazil) (2024.05.15 – ...) |
|
 Bishop Leonard James Olivier, S.V.D.
Lead me guide me | Born: | 1923.10.12 (Lake Charles, LA, USA) | | Ordained Priest: | 1951.06.29 | | Consecrated Bishop: | 1988.12.20 | | Died: | 2014.11.19 († 91) |
| Auxiliary Bishop of Washington (USA) (1988.11.10 – 2004.05.18) Titular Bishop of Legia (1988.11.10 – 2014.11.19) |
|
 Bishop Agostino Olivieri, Sch. P.
| Born: | 1758.01.22 (Switzerland) | | Ordained Priest: | 1782.09.21 | | Died: | 1834.05.10 († 76) |
| Titular Bishop of Arethusus (1807.08.03 – 1834.05.10) |
|
Bishop Thomas Olivieri | Consecrated Bishop: | 1706.06.27 | | Died: | 1719.02 |
| Coadjutor Bishop of Strongoli (1706.06.25 – 1719.02) |
|
Bishop Giuseppe Olivotti | Born: | 1905.11.20 (Italy) | | Ordained Priest: | 1929.07.21 | | Consecrated Bishop: | 1957.03.19 | | Died: | 1974.03.09 († 68) |
| Titular Bishop of Samos (1957.02.10 – 1974.03.09) Auxiliary Bishop of Venezia (Italy) (1957.02.10 – 1974.03.09) |
|
 Bishop Jean-François Ollivier, M.E.P.
| Born: | 1791.09.09 (France) | | Ordained Priest: | 1818.03.21 | | Consecrated Bishop: | 1825.08.21 | | Died: | 1827.05.27 († 35) |
| Titular Bishop of Castoria (1824.04.06 – 1827.05.27) Coadjutor Vicar Apostolic of Western Tonking (Vietnam) (1824.04.06 – 1827.05.27) |
|
Bishop Vigilio Mario Olmi In te Domine speravi | Born: | 1927.08.14 (Coccaglio, Italy) | | Ordained Priest: | 1950.06.25 | | Consecrated Bishop: | 1986.05.18 | | Died: | 2019.01.25 (Brescia, Italy † 91) |
| Auxiliary Bishop of Brescia (Italy) (1986.03.20 – 2003.03.25) Titular Bishop of Gunugus (1986.03.20 – 2019.01.25) |
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Bishop Blas Antonio Olóriz | Born: | 1677.02.03 | | Consecrated Bishop: | 1733.12.13 |
| Titular Bishop of Thagaste (1733.12.02 – ?) Auxiliary Bishop of Monreale (Italy) (1733.12.02 – ?) |
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Bishop Józef Olszański | Born: | 1685.12 | | Consecrated Bishop: | 1728.01.18 | | Died: | 1738.05.16 († 52) |
| Titular Bishop of Serræ (1727.06.25 – 1738.05.16) Auxiliary Bishop of Chełm (1727.06.25 – 1738.05.16) |
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Bishop Grzegorz Olszowski (57) Titular Bishop of Rhoga
Auxiliary Bishop of Katowice (Poland)
Ku chwale Boga Ojca | Born: | 1967.02.15 (Mikołów, Poland) | | Ordained Priest: | 1995.05.13 | | Consecrated Bishop: | 2018.09.12 |
| Priest of Katowice (Poland) (1995.05.13 – 2018.06.13) Titular Bishop of Rhoga (2018.06.13 – ...) Auxiliary Bishop of Katowice (Poland) (2018.06.13 – ...) |
|
 Bishop Dermot Patrick O’Mahony
| Born: | 1935.02.18 (Ireland) | | Ordained Priest: | 1960.05.29 | | Consecrated Bishop: | 1975.04.13 | | Died: | 2015.12.10 († 80) |
| Auxiliary Bishop of Dublin (Ireland) (1975.02.13 – 1996.06.07) Titular Bishop of Thiava (1975.02.13 – 2015.12.10) |
|
Bishop Dennis Patrick O’Neil | Born: | 1940.01.16 (USA) | | Ordained Priest: | 1966.04.30 | | Consecrated Bishop: | 2001.03.27 | | Died: | 2003.10.17 († 63) |
| Priest of Los Angeles (USA) (1966.04.30 – 2001.01.16) Titular Bishop of Macon (2001.01.16 – 2003.10.17) Auxiliary Bishop of San Bernardino (USA) (2001.01.16 – 2003.10.17) |
|
 Bishop Hugh John O’Neill
| Born: | 1898.06.29 (New Zealand) | | Ordained Priest: | 1921.07.31 | | Consecrated Bishop: | 1943.03.25 | | Died: | 1955.12.27 († 57) |
| Coadjutor Bishop of Dunedin (New Zealand) (1943.01.18 – 1949) Titular Bishop of Bareta (1943.01.18 – 1955.12.27) |
|
 Bishop Quirin Op dem Veld von Willich
| Titular Bishop of Cyrene (1521.10.25 – 1537.11.09) Auxiliary Bishop of Köln (Germany) (1521.10.25 – 1537.11.09) |
|
Bishop Adam Wojna Oranski | Born: | 1697.01 | | Ordained Priest: | 1720.02.24 | | Died: | 1778 († 81) |
| Titular Bishop of Belline (1730.12.18 – 1778) Auxiliary Bishop of Kamyanets-Podilsky (Ukraine) (1730.12.18 – 1778) |
|
Bishop Radosław Orchowicz (54) Titular Bishop of Surista
Auxiliary Bishop of Gniezno (Poland)
Radujcie się w panu | Born: | 1970.01.21 (Wysoka, Poland) | | Ordained Priest: | 1994.05.21 | | Consecrated Bishop: | 2022.03.19 |
| Priest of Gniezno (Poland) (1994.05.21 – 2022.01.26) Titular Bishop of Surista (2022.01.26 – ...) Auxiliary Bishop of Gniezno (Poland) (2022.01.26 – ...) |
|
 Bishop Ángel Maximiliano Ordoñez Sigcho (52)
Titular Bishop of Phelbes
Auxiliary Bishop of Quito (Ecuador)
| Born: | 1972.01.15 (Saraguro, Ecuador) | | Ordained Priest: | 2007.06.27 | | Consecrated Bishop: | 2022.12.10 |
| Priest of Quito (Ecuador) (2007.06.27 – 2022.10.17) Titular Bishop of Phelbes (2022.10.17 – ...) Auxiliary Bishop of Quito (Ecuador) (2022.10.17 – ...) |
|
Bishop Peter Joseph O’Reilly | Born: | 1850.04.14 (Ireland) | | Ordained Priest: | 1877.06.24 | | Consecrated Bishop: | 1900.09.21 | | Died: | 1923.12.18 († 73) |
| Titular Bishop of Lebedus (1900.06.20 – 1923.12.18) Auxiliary Bishop of Peoria (USA) (1900.06.20 – 1923.12.18) |
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Bishop Luis Enrique Orellana Ricaurte, S.J. | Born: | 1914.10.28 (Ecuador) | | Ordained Priest: | 1945.07.15 | | Consecrated Bishop: | 1978.04.09 | | Died: | 1997.12.16 († 83) |
| Auxiliary Bishop of Guayaquil (Ecuador) (1978.01.26 – 1986) Titular Bishop of Bennefa (1978.01.26 – 1997.12.16) Auxiliary Bishop of Quito (Ecuador) (1986 – 1994.11.26) |
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Bishop Pedro Oriona, O. de M. | Titular Bishop of Columbica (1549.01.18 – 1560) Auxiliary Bishop of Toledo (Spain) (1549.01.18 – 1560) |
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Bishop Pedro Orozco, O.F.M. | Titular Bishop of Temnus (1643.12.14 – ?) Auxiliary Bishop of Toledo (Spain) (1643.12.14 – ?) |
|
 Bishop Francisco Orozco Lomelín
| Born: | 1917.07.04 (Mexico) | | Ordained Priest: | 1940.10.27 | | Consecrated Bishop: | 1952.06.20 | | Died: | 1990.10.17 († 73) |
| Titular Bishop of Vita (1952.03.19 – 1990.10.17) Auxiliary Bishop of México (Mexico) (1952.03.19 – 1990.10.17) |
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Archbishop Cesare Orsenigo Dominus illuminatio mea | Born: | 1873.12.13 (Italy) | | Ordained Priest: | 1896.07.05 | | Consecrated Bishop: | 1922.06.25 | | Died: | 1946.04.01 († 72) |
| Titular Archbishop of Ptolemais in Libya (1922.06.23 – 1946.04.01) Apostolic Internuncio to Netherlands (1922.06.24 – 1925.05.03) Apostolic Nuncio to Hungary (1925.06.02 – 1930.02.14) Apostolic Nuncio to Germany (1930.02.14 – 1945.02.08) Apostolic Nuncio to Prussia (1930.02.18 – 1934.05.31) |
|
 Bishop Andreas Ország
| Born: | 1726.11 | | Ordained Priest: | 1750.01.18 | | Consecrated Bishop: | 1776.05.19 | | Died: | 1788.02.18 († 61) |
| Titular Bishop of Myndus (1776.04.15 – 1788.02.18) Auxiliary Bishop of Pécs (Hungary) (1776.04.15 – 1788.02.18) |
|
Bishop Antonio Ortega Franco, C.O. Omnia in lætitia | Born: | 1941.12.22 (Empalme Escobedo, Mexico) | | Ordained Priest: | 1968.11.24 | | Consecrated Bishop: | 2004.03.26 | | Died: | 2022.02.01 (México, Mexico † 80) |
| Auxiliary Bishop of México (Mexico) (2004.02.11 – 2019.02.16) Titular Bishop of Lete (2004.02.11 – 2022.02.01) |
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Bishop Fernando Ortega Ortega (50) Titular Bishop of Thizica
Auxiliary Bishop of Cuenca (Ecuador)
Humilis servus Domini | Born: | 1973.11.15 (Ambato, Ecuador) | | Ordained Priest: | 2006.06.23 | | Consecrated Bishop: | 2023.09.09 |
| Priest of Ambato (Ecuador) (2006.06.23 – 2023.06.09) Titular Bishop of Thizica (2023.06.09 – ...) Auxiliary Bishop of Cuenca (Ecuador) (2023.06.09 – ...) |
|
 Bishop Mariano Ortiz y Urruela
| Born: | 1818.10.12 (Guatemala) | | Ordained Priest: | 1844.09.29 | | Died: | 1873.06.06 († 54) |
| Titular Bishop of Teja (1866.06.25 – 1873.06.06) Coadjutor Bishop of San Salvador (El Salvador) (1866.06.25 – 1873.06.06) |
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Bishop Soter Stephen Ortynsky de Labetz, O.S.B.M. (Ukrainian Rite) | Born: | 1866.01.29 (Ortynychi, Ukraine) | | Ordained Priest: | 1891.07.18 | | Consecrated Bishop: | 1907.05.12 | | Died: | 1916.03.24 (Philadelphia, PA, USA † 50) |
| Titular Bishop of Daulis (1907.02.28 – 1916.03.24) Ordinary of United States of America of the Ukrainians (USA) (1907.02.28 – 1916.03.24) |
|
 Bishop Hernando Eusebio Oscot y Colombres, O.P.
| Born: | 1694.03.05 (Spain) | | Consecrated Bishop: | 1739.05.10 | | Died: | 1743.11.28 († 49) |
| Titular Bishop of Evaria (1737.10.01 – 1743.11.28) Coadjutor Vicar Apostolic of Fujian 福建 (China) (1737.10.01 – 1743.11.28) |
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Archbishop Leone Giacomo Ossola, O.F.M. Cap. Pro Domino rapiens et rugiens | Born: | 1887.05.12 (Italy) | | Ordained Priest: | 1909.10.28 | | Consecrated Bishop: | 1937.10.17 | | Died: | 1951.10.17 († 64) |
| Vicar Apostolic of Harar (Ethiopia) (1937.09.22 – 1943.10.19) Titular Bishop of Salona (1937.09.22 – 1945.09.09) Apostolic Administrator of Novara (Italy) (1943.10.19 – 1945.09.09) Bishop of Novara (Italy) (1945.09.09 – 1951.06.11) Titular Archbishop of Hierpiniana (1951.06.11 – 1951.10.17) |
|
Bishop Friedrich Ostermann | Born: | 1932.06.21 (Germany) | | Ordained Priest: | 1958.02.11 | | Consecrated Bishop: | 1981.09.13 | | Died: | 2018.10.22 († 86) |
| Auxiliary Bishop of Münster (Germany) (1981.06.27 – 2007.07.18) Titular Bishop of Dolia (1981.06.27 – 2018.10.22) |
|
 Bishop Frederic Osterrath, O.S.B. Subl.
| Born: | 1882.11.04 (Belgium) | | Ordained Priest: | 1906.03.16 | | Consecrated Bishop: | 1940.03.03 | | Died: | 1960.07.22 († 77) |
| Abbot Ordinary of Pietersburg (South Africa) (1939.11.14 – 1952.10) Titular Bishop of Tingis (1939.11.14 – 1956.11.14) Titular Bishop of Syedra (1956.11.14 – 1960.07.22) |
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Bishop Daniel Eliasz Ostrowski | Born: | 1762.07.25 | | Ordained Priest: | 1790.03.20 | | Consecrated Bishop: | 1816.06.30 | | Died: | 1831.09.04 († 69) |
| Titular Bishop of Bethsaida (1815.12.18 – 1831.09.04) Auxiliary Bishop of Gniezno (Poland) (1815.12.18 – 1831.09.04) |
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Bishop Janusz Ostrowski (59) Titular Bishop of Caltadria
Auxiliary Bishop of Warmia (Poland)
Jesu in te confido | Born: | 1964.11.16 (Olsztyn, Poland) | | Ordained Priest: | 1991.05.25 | | Consecrated Bishop: | 2018.04.21 |
| Priest of Warmia (Poland) (1991.05.25 – 2018.02.27) Titular Bishop of Caltadria (2018.02.27 – ...) Auxiliary Bishop of Warmia (Poland) (2018.02.27 – ...) |
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 Archbishop Karel Otčenášek
Caritas Dei, patientia Christi, honorificentia populi nostri | Born: | 1920.04.13 (České Meziříčí, Czechia) | | Ordained Priest: | 1945.03.17 | | Consecrated Bishop: | 1950.04.30 | | Died: | 2011.05.23 († 91) |
| Apostolic Administrator sede plena of Hradec Králové (Czechia) (1950.03.30 – 1956.11.12) Titular Bishop of Chersonesus in Creta (1950.03.30 – 1989.12.21) Apostolic Administrator of Hradec Králové (Czechia) (1956.11.12 – 1989.12.21) Bishop of Hradec Králové (Czechia) (1989.12.21 – 1998.06.06) Archbishop ad personam (1998.09.24 – 2011.05.23) |
|
 Bishop Agustín Otero Largacha, O.A.R.
| Born: | 1940.08.28 (Colombia) | | Ordained Priest: | 1964.07.26 | | Consecrated Bishop: | 1986.06.13 | | Died: | 2004.05.09 († 63) |
| Titular Bishop of Rotaria (1986.05.03 – 2004.05.09) Auxiliary Bishop of Bogotá (Colombia) (1986.05.03 – 2004.05.09) |
|
 Archbishop Giacomo Guido Ottonello (78)
Titular Archbishop of Sasabe
| Born: | 1946.08.29 (Masone, Italy) | | Ordained Priest: | 1971.06.29 | | Consecrated Bishop: | 2000.01.06 |
| Priest of Acqui (Italy) (1971.06.29 – 1999.11.29) Chaplain of His Holiness (1981.04.10 – 1994.06.15) Prelate of Honour of His Holiness (1994.06.15 – 1999.11.29) Apostolic Nuncio to Panama (1999.11.29 – 2005.02.26) Titular Archbishop of Sasabe (1999.11.29 – ...) Apostolic Nuncio to Ecuador (2005.02.26 – 2017.04.01) Apostolic Nuncio to Slovakia (2017.04.01 – 2021.10.31) |
|
  Bishop Joseph John Oudeman, O.F.M. Cap. (82)
Titular Bishop of Respecta
Auxiliary Bishop emeritus of Brisbane (Australia)
Pax et Bonum | Born: | 1942.03.02 (Breda, Netherlands) | | Ordained Priest: | 1966.06.29 | | Consecrated Bishop: | 2003.02.11 |
| Auxiliary Bishop of Brisbane (Australia) (2002.11.30 – 2017.03.28) Titular Bishop of Respecta (2002.11.30 – ...) |
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Bishop Adalberto Stanislao Owczarek | Born: | 1875.12.31 (Poland) | | Ordained Priest: | 1898.07.03 | | Consecrated Bishop: | 1918.11.10 | | Died: | 1938.09.30 († 62) |
| Titular Bishop of Ascalon (1918.07.29 – 1938.09.30) Auxiliary Bishop of Włocławek (Poland) (1918.07.29 – 1938.09.30) |
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