O'
- O'Brien, David J. - p.20
- O'Brien, John A. (John Anthony), 1893-1980 - 376, 512
- O'Brien, John A., 1838-1917 - 377
- O'Brien, John J., 1871-1946 - 271
- O'Callaghan, Eugene, 1831-1901 - 378
- O'Connell, Andrew - 332
- O'Connell, Denis Joseph, 1849-1927 - 96, 278, 455
- O'Connell, Edmund J., d. 1924 - 379
- O'Connell, John A., 1850-1894 - 380
- O'Connell, John Berthram, 1888- - 316
- O'Connell, Marvin Richard - 381
- O'Connell, William, 1859-1944 - 9
- O'Connor, Charles G. (Charles Gary) - 316
- O'Connor, Edwin - 387, 417
- O'Connor, Henry, 1820-1900 - 382
- O'Connor, Lillian - 383
- O'Connor, Michael, 1810-1872 - 300, 474, 476
- O'Conor, Charles, 1804-1884 - 122
- O'Dea, Margaret, 1840-1915 - 327
- O'Delany, M. Barry - 15
- O'Donnell, Charles L., 1884-1934 - 132, 384, 499, p.5
- O'Donnell, J. Hugh, 1895-1947 - 508, p.20
- O'Donohoe, Joseph G. - 506
- O'Donovan Rossa, Jeremiah, 1831-1915 - 265
- O'Donovan Rossa, Mary Jane Irwin, 1845-1916 - 265
- O'Gara, James C. - 126
- O'Gorman, Thomas, 1843-1921 - 193
- O'Grady, Desmond, 1935- - 355
- O'Hara, Edwin V., 1881-1956 - 296
- O'Hara, Elizabeth, 1940-1951 - 385
- O'Hara, John F., 1888-1960 - 116, 246, 269, 348, 363, 384, 385, 469, 508, 527, 531, p.5-6
- O'Keefe, Mary - 354
- O'Malley, Austin, 1858-1932 - 386
- O'Malley, Francis J. (Frank), 1909-1974 - 366, 387
- O'Meara, Joseph, 1989- - 388
- O'Meara, Kenneth - p.20
- O'Neill, Daniel J. - p.20
- O'Regan, Anthony, 1809-1866 - 76
- O'Shaughnessy, Michael James, 1874-1946 - 389
- O'Sullivan, Timothy D., 1838-1910 - 390
- O'Toole, Christopher J. (Christopher John), 1906-1986 - 209
O
- Obituaries - 15, 50, 77, 79, 123, 137, 318, 378, 419, 456, 463, 494, 537
- Oblates of Providence - 391
- Obscenity (Law) - 388
- Och, Joseph, 1725?-1773 - 206
- Odin, John Mary, 1801-1870 - 80, 392, 471, 476, 484, 522
- Oesterle, John A. - 365
- Official List of the Officers who were in the Campaign of Mexico in 1847 - 287
- Ohio
- _____ Catholic Churches and Institutional Buildings (photographs) - p.20
- _____ Civil War, 1861-1865 - 54
- Ojibwa Indians - 21, 77
- Oklahoma City and Tulsa (Okla.), Diocese of - 73
- Old Saint Mary's Church (Chicago, Ill.) - 429
- Omaha (Neb.), Archdiocese of - 73
- Onahan, William James, 1836-1919 - 171, 393
- Onassis, Jacqueline Kennedy, 1929- - 107
- Once Upon a Parable: Fables for the Present - 27
- Ontology - 469
- Openers (Implements) - 416
- Oral Histories - 6, 237, 343, 423, p.21
- Orchids - 209
- Ordination of women - 302, 314
- Ordo Divini Officii Recitandi - 211
- Oregon City (Or.), Archdiocese of - 38, 73
- Orphanages - 17, 100, 398, 411
- Ortega y Gasset, Jose, 1883-1955 - 273
- Ortiz, Ramon - 97
- Osberger, Daniel - p.6
- Ostovic, Pavle D. - 333
- Ottawa Indians - 21, 77
- Our Sunday Visitor - 364, 371, 394
- Ourselves, Inc. Manuscript - 531
- Overseas Development Council - 237
- Owens, Lilliana, 1898- - 395
- Owensboro (Ky.), Diocese of - 73
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