Members of the Passionist Congregation whose surname begins with O, who died before 1970. 186 entries.
| Name | Died | Ordained |
|---|---|---|
| Father Fintan O’Beirne | 1936 | 1920 |
| Father Macartin O’Beirne | 1927 | 1923 |
| Brother Kieran O’Boyle | 1967 | |
| Father Aloysius O’Brien | 1905 | 1894 |
| Father Bede O’Brien | 1961 | 1911 |
| Brother Bernard O’Brien | 1957 | |
| Father Conon O’Brien | 1964 | 1924 |
| Brother Conor O’Brien | 1947 | |
| Brother Damian O’Brien | 1896 | |
| Brother Dermot O’Brien | 1948 | |
| Father Gregory O’Brien | 1927 | 1893 |
| Father Joachim O’Brien | 1925 | 1896 |
| Brother John O’Brien | 1969 | |
| Brother Jude O’Brien | 1931 | |
| Father Justin O’Brien | 1882 | 1881 |
| Brother Martin O’Brien | 1968 | |
| Brother Matthew O’Brien | 1952 | |
| Father Michael O’Brien | 1944 | 1917 |
| Brother Michael Raymond O’Brien | 1968 | |
| Brother William O’Brien | 1930 | |
| Father Matthias O’Byrne | 1956 | 1931 |
| Brother Camillus O’Carroll | 1862 | |
| Father Joseph O’Carroll | 1874 | 1859 |
| Brother Joseph O’Carroll | 1939 | |
| Brother Denis O’Connell | 1963 | |
| Brother Michael O’Connell | 1948 | |
| Brother Romuald O’Connell | 1955 | |
| Father Salvian O’Connell | 1932 | 1929 |
| Brother Silvester O’Connell | 1913 | |
| Brother Adrian O’Connor | 1947 | |
| Father Alban O’Connor | 1886 | 1881 |
| Father Aloysius O’Connor | 1899 | 1895 |
| Father Benito O’Connor | 1946 | 1904 |
| Father Constantine O’Connor | 1911 | 1905 |
| Brother John Francis O’Connor | 1927 | |
| Father Pius O’Connor | 1916 | 1881 |
| Father Ronan O’Connor | 1939 | 1903 |
| Father Thomas O’Connor | 1913 | 1864 |
| Father Vincent O’Connor | 1926 | 1917 |
| Brother Philip O’Doherty | 1934 | |
| Brother Augustine O’Donnell | 1862 | |
| Brother Brennan O’Donnell | 1966 | |
| Father Hilary O’Donnell | 1964 | 1945 |
| Father Patrick O’Donnell | 1962 | 1949 |
| Father Philip William O’Donnell (Tiernan) | 1961 | 1922 |
| Brother Declan O’Donovan | 1967 | |
| Father Patrick O’Farrell | 1884 | 1880 |
| Father Cuthbert O’Gara | 1968 | 1915 |
| Brother Salvian O’Grady | 1911 | |
| Brother Leonard O’Hagan | 1959 | |
| Brother Cronan O’Hara | 1942 | |
| Father Lambert O’Hara | 1955 | 1938 |
| Father Alexander O’Hare | 1905 | 1892 |
| Brother Ambrose O’Hare | 1956 | |
| Father Constantine O’Hare | 1899 | 1890 |
| Father Peter O’Hare | 1926 | 1911 |
| Brother Adrian O’Kane | 1964 | |
| Father Raymond O’Keefe | 1913 | 1886 |
| Brother Walter O’Keefe | 1955 | |
| Brother Marian O’Keiff | 1919 | |
| Father Malachy O’Leary | 1921 | 1909 |
| Brother Germanus O’Loughlin | 1964 | |
| Father Thomas O’Mahoney | 1911 | 1906 |
| Brother Richard Leo O’Malley | 1969 | |
| Father Finbar O’Meara | 1959 | 1931 |
| Brother Canisius O’Melia | 1918 | |
| Father Joseph Patr. O’Neil | 1958 | 1933 |
| Brother Martin O’Neil | 1927 | |
| Brother Paul Bourne O’Neil | 1966 | |
| Brother Benignus O’Neill | 1913 | |
| Father Dominic O’Neill | 1917 | 1868 |
| Father Gerald O’Neill | 1953 | 1904 |
| Father Jerome O’Neill | 1881 | 1879 |
| Father Joseph O’Neill | 1930 | 1917 |
| Father Reginald O’Neill | 1964 | 1918 |
| Brother Cyprian O’Reilly | 1904 | |
| Father Gordian O’Reilly | 1964 | 1924 |
| Father Linus O’Reilly | 1895 | 1892 |
| Father Damian O’Rourke | 1969 | 1906 |
| Father Hilarion O’Rourke | 1968 | 1908 |
| Brother Anthony O’Shea | 1958 | |
| Father Edward O’Sullivan | 1964 | 1911 |
| Brother Eusebius O’Sullivan | 1936 | |
| Father Ildefonso Obach Aldab | 1903 | 1861 |
| Brother Balbino Obejero Torio | 1903 | |
| Brother Emiliano Obejero Torio | 1898 | |
| Father Bonaventure Oberst | 1948 | 1907 |
| Brother Norbert Obidzinski | 1939 | |
| Father Juan Bautista Ochoa Montoya | 1913 | 1890 |
| Brother Ambrosio Ochoa Vzquez | 1939 | |
| Father Sebastian Ochsenreiter | 1943 | 1903 |
| Brother Daniele Oddi | 1956 | |
| Brother Giacomo Oddone | 1917 | |
| Brother Martn Odriozola Amundarain | 1932 | |
| Brother Ignacio Odriozola Ceberio | 1947 | |
| Father Pacfico Odriozola Urteaga | 1926 | 1908 |
| Brother Leo Ofer | 1966 | |
| Brother Gabriele Ofria | 1928 | |
| Brother Vctor Olaechea Irazola | 1969 | |
| Father Jos Ramn Olaechea Odriozola | 1969 | 1955 |
| Father Juan Carlos Olaechea Odriozola | 1968 | 1957 |
| Brother Luis Olano Olano | 1932 | |
| Brother Pascual Olarn Urteaga | 1906 | |
| Brother Lucas Olave Gallstegui | 1953 | |
| Brother Mariano Olazabalaga Etxeandia | 1959 | |
| Brother Antonio Olazar Belaustegui | 1934 | |
| Brother Flix Olazbal Alzaga | 1950 | |
| Brother Eusebio Olcoz Leoz | 1923 | |
| Brother Camillo Oldani | 1856 | |
| Brother Matas Olea Arrida | 1918 | |
| Brother Leonardo Olea Belarrinaga | 1937 | |
| Brother Karol Olender | 1954 | |
| Brother Emmeran Olermeier | 1938 | |
| Brother Norberto Olivares Nieto | 1905 | |
| Brother Gabriel Olivas | 1964 | |
| Brother Rocco Oliverio | 1957 | |
| Brother Giulio Olivi | 1887 | |
| Father Agostino Olivieri | 1874 | 1827 |
| Father Clemente Olivieri | 1916 | 1908 |
| Brother Eleuterio Olivieri | 1956 | |
| Brother Pawel Olkowski | 1955 | |
| Brother Cndido Onederra Salogui | 1935 | |
| Brother Alejandro Onederra Salorgui | 1939 | |
| Brother Angelo Onofri | 1857 | |
| Father Filippo Onofri | 1881 | 1839 |
| Father Filippo Onofri | 1902 | 1900 |
| Father Timoteo Onofri | 1926 | 1870 |
| Father Patricio Ontoria Sainz | 1953 | 1893 |
| Father Albertus Op ‘T Broek | 1857 | 1850 |
| Father Bernard Opalach | 1969 | 1954 |
| Brother Bernardo Orabona | 1958 | |
| Brother Justino Orbe Zelaya | 1949 | |
| Brother Juan Antonio Orbegozo Jauregui | 1953 | |
| Father Salvatore Orchi | 1867 | 1857 |
| Brother Felice Orefice | 1935 | |
| Father Rafael Orellana Hurtado | 1938 | 1899 |
| Father Ermenegildo Oreri | 1761 | 1755 |
| Brother Arcangelo Orlandi | 1914 | |
| Father Emidio Orlandi | 1959 | 1900 |
| Brother Federico Orlandi | 1894 | |
| Brother Fortunato Orlandi | 1902 | |
| Brother Gaetano Orlandi | 1907 | |
| Brother Pietro P. Orlandi | 1897 | |
| Brother Saverio Orlandi | 1871 | |
| Father Carlo Orlando | 1957 | 1927 |
| Brother Diego Ormaetxe Goiri | 1955 | |
| Brother Eufrasio Ormaetxea Goiri | 1928 | |
| Father Lorenzo Ormazbal Leunda | 1961 | 1920 |
| Brother Stanislaus Ormerod | 1954 | |
| Brother Tarcisio Oro Garca | 1951 | |
| Brother Louis Christopher Oropeza | 1967 | |
| Brother Jos Lus Orosa Roldn | 1962 | |
| Brother Tommaso Orsini | 1963 | |
| Brother Pelagio Ortega Ruiz | 1939 | |
| Father Luigi M. Orticelli | 1962 | 1938 |
| Brother Fulgencio Ortiz Ruiz y Pinedo | 1895 | |
| Brother Volfgangus Ortmann | 1968 | |
| Father Teodoro Orue Daobeitia | 1949 | 1921 |
| Brother Thomas Osborne | 1853 | |
| Brother Louis Ossweiler | 1916 | |
| Father Franz Ostwald | 1933 | 1930 |
| Brother Toms Oss Daz | 1937 | |
| Brother Jos Oss Sinz | 1936 | |
| Brother Marcos Otegui Sarasola | 1958 | |
| Brother Eugenio Otero Palacio | 1928 | |
| Brother Placidus Otis | 1876 | |
| Brother Emanuele Ottaviani | 1947 | |
| Brother Felice Ottaviani | 1775 | |
| Brother Ildefonso Ottaviani | 1931 | |
| Brother Ippolito Ottaviani | 1906 | |
| Father Nicola Ottaviani | 1802 | 1796 |
| Brother Glennon Richard Otten | 1969 | |
| Father Pancratius Otten | 1966 | 1951 |
| Brother Ignatius Ottey | 1954 | |
| Brother Martin Otto | 1903 | |
| Brother Federico Ottolia | 1801 | |
| Brother Albert Outtier | 1908 | |
| Brother Dominic Ouvrier | 1918 | |
| Father Raymond Ouvrier | 1963 | 1933 |
| Father Rafael Ovejas Alvarez | 1936 | 1932 |
| Brother Ioannes Overvliet | 1965 | |
| Brother Michael Owen | 1897 | |
| Brother Michael Thomas Owens | 1969 | |
| Brother Justino Oyarbide Oyarbide | 1909 | |
| Brother Toms Oyarbide Zubiaga | 1969 | |
| Father Bernardo Mara Oativia Enatarriaga | 1969 | 1922 |