| ISSN | Title | Holdings | Location | Notes |
|---|---|---|---|---|
| 0882-228X | OAH Magazine of History | Periodical Room | See Magazine of History | |
| OBU Magazine | Vol. 1(2003)-present | Periodical Room | ||
| 8756-5196 | OCLC Micro | Vol.6(1990)-Vol.7(1991) | Periodical Room | Renamed: OCLC Systems and Services in 1993 |
| 1065-075X | OCLC Systems and Services | Vol.9(1993)-Vol.14(1998) | Periodical Room | |
| 0029-8174 | Oceans | Vol.15(1982) | Microfilm | |
| 0029-8174 | Oceans | Vol.16-17(1983-1984) | Microfiche | |
| 0029-8174 | Oceans | Periodical Room Vol.18n1-5(1985), Vol.21n6(1988), Vol.22n1(1989). | Periodical Room | |
| 0029-8182 | Oceanus | Vol.34(1991)-Vol.35(1992) | Periodical Room | |
| 0199-4786 | Occupational Outlook Quarterly | Vol.22(1978)-Vol.23(1979) | Annex II | Government Document: L 2.7/4: |
| 0199-4786 | Occupational Outlook Quarterly | Vol.24(1980)-Present | Periodical Room | Government Document: L 2.7/4: |
| 0031-5737 | Occupations | Vol.24(1945)-Vol.30(1952) | Annex II | Renamed: and shelved with: Personnel and Guidance Journal in 1952 |
| 0030-0128 | Office: Magazine of Information Systems and Management | Vol.81(1975)-Vol.90(1979) | Annex II | |
| 0030-0128 | Office: Magazine of Information Systems and Management | Vol.91(1980)-Vol.117(1993) | Periodical Room | |
| 0745-4325 | Office Administration and Automation | Vol.44(1983)-Vol.46(1985) | Periodical Room | Renamed: Administrative Management in 1985 |
| 1529-1804 | Office Solutions | Vol.17n3(2000)-Vol.21n1(2004) | Periodical Room | Formerly: Office Systems, Vol.17(2000) |
| 8750-3441 | Office Systems | Vol.8(1991)-Vol.16(1999) | Periodical Room | Renamed: Office Solutions (2000) |
| Oklahoma | Vol.1(1996)-Vol.8(2004) | Periodical Room | ||
| 0078-4303 | Oklahoma Academy of Sciences. Proceedings | See Proceedings of the Oklahoma Academy of Sciences | ||
| 0273-7922 | Oklahoma Educator | Vol.18(1989)-Vol.21(1992) | Periodical Room | |
| 0030-1760 | Oklahoma Librarian | Vol.2(1952)-Vol.28(1978) | Annex II | |
| Oklahoma Monthly | Vol.2(1976)-Vol.7(1981) | Annex II | ||
| 0030-1795 | Oklahoma Observer | Vol.28(1996)-Present | Periodical Room | |
| 0474-0750 | Oklahoma Ornithological Society. Bulletin | See Bulletin of the Oklahoma Ornithological Society | ||
| Oklahoma Teacher(Old Series) | Vol.31(1949)-Vol.55(1973) | Annex II | ||
| 0030-1884 | Oklahoma Teacher (New Series) | Vol.1(1974)-Vol.4(1976) | Annex II | |
| 0030-1892 | Oklahoma Today | Vol.1(1956)-Vol.2(1960); Vol.14(1964/65)-Vol.29(1979) | Annex II | |
| 0030-1892 | Oklahoma Today | Vol. 30(1980)- Present | Periodical Room | |
| 0199-9524 | Oklahoma Wildlife | Vol.18(1962)-Vol.21(1965) | Annex II | Renamed: Outdoor Oklahoma in 1965 |
| Oklahoman (Daily and Sunday) | See Daily Oklahoman | |||
| 0364-8591 | Old Testament Abstracts | Vol.14(1991)-Present | Reference Room | |
| 0149-8711 | Omni | Vol.1(1978/1979) | Annex II | |
| 0149-8711 | Omni | Vol.2(1979)-Vol.6(1984); Vol.11(1988)-Vol.16(1993) | Periodical Room | |
| 0149-8711 | Omni | Vol.5(1982)-Vol.14(1992) | Microfiche | |
| 0146-5422 | Online | Vol.15(1991)-Vol.20(1996) | Periodical Room | |
| 0030-3607 | Opera News | Vol.8(1943)-Vol.43(1979) | Annex II | |
| 0030-3607 | Opera News | Vol.44(1979)-Vol.58(1994) | Periodical Room | |
| 0882-228X | Organization of American Historians Magazine of History | See OAH Magazine of History | ||
| 0749-5978 | Organizational Behavior and Human Decision Processes | Vol.48(1991)-Vol.81(1999/2000) | Periodical Room | . |
| 0090-2616 | Organizational Dynamics | Vol.20(1991)-Vol.28n2(1999) | Periodical Room | . |
| 0030-7106 | Outdoor Oklahoma | Vol.21(1965)-Vol.35(1979) | Annex II | |
| 0030-7106 | Outdoor Oklahoma | Vol.36(1980)-Present | Periodical Room | |
| 0278-1433 | Outside | Vol.20(1995)-Present | Periodical Room | |
| 0196-433X | Ovation | Vol.5(1984)-Vol.10(1989) | Periodical Room | Merged with Classical in 1989 |
| Overseas Personnel Directory | (1994-1999) | Periodical Room | Southern Baptist International Mission Board Directory |