- O'Brien, William Smith, 1862-19481
- O'Ferrall, Charles T. (Charles Triplett), 1840-19051
- O'Shaughnessy, Louis1
- O'Shaughnessy, Mary Elizabeth, 1917-1
- O'Sullivan, Daniel, 1828-19043
- O'Sullivan, T. J. (Timothy Joseph), 1855-18871
- Oak Grove Baptist Church1
- Ochs family1
- Ochsner, Albert H., c.1889-19641
- Ochsner, Fleda Fiske1
- Office of Admissions1
- Office of the President7
- Office of the Vice President for Administration1
- Office of the Vice President for Student Affairs.1
- Offley, Cleand Nelson, 1869-19301