Periodicals O
| Title | Holdings |
| O, The Oprah Magazine | 2000, May+ |
| O.C.C. Career Corner Newsletter | Current 3 copies |
| OAG Business Travel Planner | Current month |
| OAG Desktop Flight Guide (No. American Ed.) | Current month |
| OAG Desktop Flight Guide (Worldwide Ed.) | Current month |
| Occupational Outlook Quarterly | 1988+ |
| Oceans | 1981-1989,Apr. |
| Odyssey | Current 2 years |
| Office (ceased publication) | 1992-1993,Oct. |
| OLAC | Current year |
| Olympian (publication suspended) | 1998-1999 |
| Omni (ceased print publication) | 1984-1995, Winter |
| Online | Current year |
| Opera News | 1970,Sept.5+ |
| Opus | 1 year |
| Organic Gardening | 1970+ |
| Organic Style | Current 2 years |
| Orion | Current 2 years |
| Other Voices | Current 3 years |
| Outdoor Illinois | Current 2 years |
| Outdoor Life | 1970+ |
| Outside | 1998+ |
| Owl Magazine | Current year |
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