| Obesity | Nature Publishing | v.8(2000)- | |
| Obesity Surgery | Ingenta | v.1(1991)-v.16(2006) | |
| Obesity Surgery | Springer-Verlag | v.17(2007)- | |
| Obstetric Anesthesia Digest | OVID | v.21(2001)- | Journals@Ovid (LWW Total Access Collection) |
| Obstetrical and Gynecological Survey | OVID | v.50(1995)- | Journals@Ovid (LWW Total Access Collection) |
| Obstetrics and Gynecology | OVID | v.85(1995)- | Journals@Ovid (LWW Total Access Collection) |
| Obstetrics and Gynecology | ScienceDirect | v.85(1995)-v.102(2003) | |
| Obstetrics and Gynecology Clinics of North America | MDConsult | v.23(1996)- | |
| Occupational and Environmental Medicine | HighWire Press, Stanford University | v.55(1998)- | |
| Occupational Hazards | Ebsco - MasterFile Premier | v.62:no.1(2000)- | |
| Occupational Health | EBSCO - Academic Search Premier | v.55:no.8(2003)- | |
| Occupational Medicine | HighWire Press, Stanford University | v.51(2001)- | |
| Occupational Therapy International | Wiley | v.3(1996)- | |
| Ohio Nurses Review | Ebsco - CINAHL Plus Full-Text | v.8:no.10(2003)- | |
| Omega | MetaPress | v.23(1995)- | |
| Oncogene (includes Oncogene Reviews) | Nature Publishing | v.14(1997)- | |
| Oncologist | HighWire Press, Stanford University | v.1(1996)- | Free as of 9/4/02 . May not be free for institutions in/after 2007 (per note at site under 'subscription'). |
| Oncology | Karger | v.55(1998)- | |
| Oncology Nursing Forum | Ebsco - CINAHL Plus Full-Text | v.27(2000)- | |
| Onkologie | Karger | v.21(1998)-v.25(2002) | |
| Online | EBSCO - Academic Search Premier | v.18(1994)- | 'Computer Science; Library & Information Sciences |
| Online Journal of Health & Allied Sciences | Directory of Open Access Journals | v.1(2002)- | Free. |
| Online Journal of Health Ethics | Directory of Open Access Journals | v.1:no.1(2004), v.1(2005)- | Free. |
| Online Journal of Issues in Nursing | EBSCO - Academic Search Premier | v.8(2003)- | |
| Online Journal of Nursing Informatics | Directory of Open Access Journals | v.4(2002)- | Free |
| Online Journal of Rural Nursing and Health Care | Directory of Open Access Journals | v.1(2000)- | Free |
| ONS News | EBSCO - Academic Search Premier | v.15(2000)- | |
| Open Biochemistry Journal | Directory of Open Access Journals | v.1(2007)- | Free. |
| Open Biomedical Engineering Journal | Directory of Open Access Journals | v.1(2007)- | Free. |
| Open Cardiovascular Medicine Journal | Directory of Open Access Journals | v.1(2007)- | Free. |
| Open Dermatology Journal | Directory of Open Access Journals | v.1(2007)- | Free. |
| Open Drug Delivery Journal | Directory of Open Access Journals | v.1(2007)- | Free. |
| Open Medicine | Directory of Open Access Journals | v.1(2007)- | Free. |
| Open Nursing Journal | Directory of Open Access Journals | v.1(2007)- | Free. |
| Open Pharmacology Journal | Directory of Open Access Journals | v.1(2007)- | Free. |
| Open Rheumatology Journal | Directory of Open Access Journals | v.1(2007)- | Free. |
| Open Surgery Journal | Directory of Open Access Journals | v.1(2007)- | Free. |
| Open Veterinary Science Journal | Directory of Open Access Journals | v.1(2007)- | Free. |
| Open Virology Journal | Directory of Open Access Journals | v.1(2007)- | Free. |
| Operative Techniques in General Surgery | ScienceDirect | v.1(1999)- | |
| Operative Techniques in Neurosurgery | ScienceDirect | v.1(1998)- | |
| Operative Techniques in Orthopaedics | ScienceDirect | v.5(1995)- | |
| Operative Techniques in Otolaryngology-Head and Neck Surgery | ScienceDirect | v.6(1995)- | |
| Operative Techniques in Sports Medicine | ScienceDirect | v.3(2005)- | |
| Operative Techniques in Thoracic and Cardiovascular Surgery | ScienceDirect | v.8:no.1(2003), v.9(2004)- | |
| Ophthalmic and Physiological Optics | ScienceDirect | v. 15(1995)-v. 21(2001) | |
| Ophthalmic Plastic and Reconstructive Surgery | OVID | v.16(2000)- | Journals@Ovid (LWW Total Access Collection) |
| Ophthalmic Research | Karger | v.30(1998)-v.34(2002) | |
| Ophthalmology | ScienceDirect | v.105(1998)- | |
| Ophthalmology Clinics of North America | MDConsult | v.11(1998)-v.19(2006) | |
| Ophthalmology Times | EBSCO - Academic Search Premier | v.20(1995)- | |
| Ophthalmology Times | Ebsco - MasterFile Premier | v.20:no.1(1995)- | |
| Optometry - Journal of the American Optometric Association | ScienceDirect | v.76:no.7(2005)- | |
| Optometry and Vision Science | OVID | v.77(2000)- | Journals@Ovid (LWW Total Access Collection) |
| OR Nurse | OVID | v.1(2007)- | |
| Oral Microbiology and Immunology | Blackwell-Synergy | v.14(1999)- | |
| Oral Oncology | ScienceDirect | v.33:no.5(1997)- | |
| Oral Oncology Extra | ScienceDirect | v.40(2004)- | |
| Oral Oncology Supplement | ScienceDirect | v.1(2005)- | |
| Oral Surgery, Oral Medicine, Oral Pathology | ScienceDirect | v.75(1994)-v.78(1995) | From v.83(1997), see new title: 'Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology'. |
| Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology | ScienceDirect | v.83(1997)- | From v.75(1993)-v.78(1994), see old title: 'Oral Surgery, Oral Medicine, Oral Pathology'. |
| Organisms Diversity & Evolution | ScienceDirect | v.1(2001)- | |
| Orphanet Journal of Rare Diseases | BioMed Central Ltd. | v.1(2006)- | Open Access title. |
| Orthopaede | Springer-Verlag | v.26(1997)- | |
| Orthopaedic Nursing | OVID | v.20(2001)- | Journals@Ovid (LWW Total Access Collection) |
| Orthopaedic Nursing | EBSCO - Academic Search Premier | v.19(2000)- | |
| Orthopedic Clinics of North America | MDConsult | v.28(1997)- | |
| Orthopedic Trauma Directions | Thieme Medical Publishers | v.1(2003)- | |
| Osteoarthritis and Cartilage | ScienceDirect | v.6(1998)- | |
| Osteopathic Medicine and Primary Care | BioMed Central Ltd. | v.1(2007)- | Open Access title. |
| Osteoporosis International | Springer-Verlag | v.7(1997)- | |
| Osteosynthesis and Trauma Care | Thieme Medical Publishers | v.9(2001)- | |
| Otolaryngologic Clinics of North America | MDConsult | v.31(1998)- | |
| Otolaryngology - Head and Neck Surgery | ScienceDirect | v.120(1999)- | |
| Otology and Neurotology | OVID | v.22(2001)- | Journals@Ovid (LWW Total Access Collection) |
| Outcomes Management | OVID | v.6(2002)- | Journals@Ovid (LWW Total Access Collection) |
| Outcomes Management for Nursing Practice | OVID | v.1(1997)-v.5(2001) | Journals@Ovid (LWW Total Access Collection) |