There are 1,545 titles that begin with the letter O
- Operations Management Education Review (ISSN: 1649-7082,EISSN: 2044-4567)
- Operations Management Research (ISSN: 1936-9735,EISSN: 1936-9743)
- Operations Research (ISSN: 0030-364X,EISSN: 1526-5463)
- Operations research and decisions (ISSN: 2081-8858)
- Operations Research for Health Care (ISSN: 2211-6923,EISSN: 2211-6931)
- Operations Research Forum (EISSN: 2662-2556)
- Operations research letters (ISSN: 0167-6377,EISSN: 1872-7468)
- Operations Research Perspectives (ISSN: 2214-7160)
- Operative dentistry (ISSN: 0361-7734,EISSN: 1559-2863)
- Operative Neurosurgery (ISSN: 2332-4252,EISSN: 2332-4260)
- Operative Orthopädie und Traumatologie (ISSN: 0934-6694,EISSN: 1439-0981)
- Operative techniques in cardiac & thoracic surgery (ISSN: 1085-5637,EISSN: 1876-4770)
- Operative techniques in general surgery (ISSN: 1524-153X,EISSN: 1558-383X)
- Operative techniques in neurosurgery (ISSN: 1092-440X,EISSN: 1557-9409)
- Operative techniques in orthopaedics (ISSN: 1048-6666,EISSN: 1558-3848)
- Operative techniques in otolaryngology--head and neck surgery (ISSN: 1043-1810,EISSN: 1557-9395)
- Operative techniques in plastic and reconstructive surgery (ISSN: 1071-0949,EISSN: 1558-0741)
- Operative techniques in sports medicine (ISSN: 1060-1872,EISSN: 1557-9794)
- Operative techniques in thoracic and cardiovascular surgery (ISSN: 1522-2942,EISSN: 1532-8627)
- Opflow (ISSN: 0149-8029,EISSN: 1551-8701)
- Ophthalmic and Physiological Optics (ISSN: 0275-5408,EISSN: 1475-1313)
- Ophthalmic epidemiology (ISSN: 0928-6586,EISSN: 1744-5086)
- Ophthalmic genetics (ISSN: 1381-6810,EISSN: 1744-5094)
- Ophthalmic paediatrics and genetics (ISSN: 0167-6784)
- Ophthalmic plastic and reconstructive surgery (ISSN: 0740-9303,EISSN: 1537-2677)
- Der Ophthalmologe (ISSN: 0941-293X,EISSN: 1433-0423)
- Ophthalmology (ISSN: 0161-6420,EISSN: 1549-4713)
- Ophthalmology and Eye Diseases (EISSN: 1179-1721)
- Ophthalmology and Therapy (ISSN: 2193-8245,EISSN: 2193-6528)
- Ophthalmology Journal (ISSN: 2450-7873,EISSN: 2450-9930)
- Ophthalmology Science (ISSN: 2666-9145)
- Ophthalmology Times (ISSN: 0193-032X,EISSN: 2150-7333)
- Ophthalmology Update (ISSN: 1993-2863)
- Opinion Piece in Macedonian Press
- L'opinion publique (ISSN: 0711-7477)
- L'opinion publique : journal illustré
- Opinião Pública (ISSN: 0104-6276,EISSN: 1807-0191)
- La Opinión (ISSN: 0276-590X)
- Opinión jurídica (ISSN: 1692-2530,EISSN: 2248-4078)
- Oplink Communications, Inc. MarketLine Company Profile
- Opolskie Studia Administracyjno-Prawne (ISSN: 1731-8297,EISSN: 2658-1922)
- Oppdragsrapport. A - Norges vassdrags- og energidirektorat (ISSN: 1503-0318)
- Oppenheimer Holdings Inc. MarketLine Company Profile
- Opportunistic pathogens (ISSN: 1386-2618,EISSN: 1878-3694)
- Opportunities for Research in Renaissance Drama (ISSN: 2378-4016,EISSN: 2380-1166)
- Opportunities for Research in Renaissance Drama (Exclusive of Shakespeare) (ISSN: 2378-3990,EISSN: 2380-1182)
- The Oppressed
- OPSEARCH (ISSN: 0030-3887,EISSN: 0975-0320)
- OPSI (ISSN: 1693-2102,EISSN: 2686-2352)
- Opsis (ISSN: 1519-3276,EISSN: 2177-5648)
- Optica (ISSN: 2334-2536)
- OPTICA APPLICATA (ISSN: 0078-5466,EISSN: 1899-7015)
- Optical and Quantum Electronics (ISSN: 0306-8919,EISSN: 1572-817X)
- Optical Cable Corporation MarketLine Company Profile
- Optical Data Processing and Storage (EISSN: 2084-8862)
- Optical Engineering (ISSN: 0091-3286,EISSN: 1560-2303)
- Optical Fiber Communication (OFC)Conference (ISSN: 1094-5695)
- Optical fiber technology (ISSN: 1068-5200,EISSN: 1095-9912)
- Optical Interconnects Conference, IEEE (ISSN: 2376-8665)
- Optical materials (Amsterdam. Print) (ISSN: 0925-3467,EISSN: 1873-1252)
- Optical materials express (ISSN: 2159-3930)
- Optical Materials: X (EISSN: 2590-1478)
- Optical Memory & Neural Networks (ISSN: 1060-992X,EISSN: 1934-7898)
- Optical Memory News (ISSN: 0741-5869)
- Optical MEMS, IEEE/LEOS International Conference on (ISSN: 2160-5033,EISSN: 2160-5041)
- Optical Nanoscopy (ISSN: 2192-2853)
- Optical Review (ISSN: 1340-6000,EISSN: 1349-9432)
- Optical switching and networking (ISSN: 1573-4277,EISSN: 1872-9770)
- Optician (ISSN: 0030-3968)
- Opticon1826 (ISSN: 2049-8128)
- Optics (EISSN: 2673-3269)
- Optics and Laser Technology (ISSN: 0030-3992,EISSN: 1879-2545)
- Optics and lasers in engineering (ISSN: 0143-8166,EISSN: 1873-0302)
- Optics and Spectroscopy (ISSN: 0030-400X,EISSN: 1562-6911)
- Optics communications (ISSN: 0030-4018,EISSN: 1873-0310)
- Optics express (ISSN: 1094-4087)
- Optics letters (ISSN: 0146-9592,EISSN: 1539-4794)
- Optics technology (ISSN: 0374-3926,EISSN: 1878-7371)
- Optik (Stuttgart) (ISSN: 0030-4026,EISSN: 1618-1336)
- Optimal Control (ISSN: 0143-2087,EISSN: 1099-1514)
- Optimal Payments Plc MarketLine Company Profile
- Optimawork Blog
- Optimization and Engineering (ISSN: 1389-4420,EISSN: 1573-2924)
- Optimization Letters (ISSN: 1862-4472,EISSN: 1862-4480)
- Optimization methods & software (ISSN: 1055-6788,EISSN: 1029-4937)
- Optimization of Electrical and Electronic Equipment, OPTIM, International Conference on (ISSN: 1842-0133)
- Optimization: Journal of Research in Management (ISSN: 0974-0988)
- Optimize (ISSN: 1537-2308)
- Optimum (ISSN: 0475-1906)
- Optimum : Ekonomi ve Yönetim Bilimleri Dergisi (EISSN: 2148-4228)
- Optimum online (ISSN: 1910-7706)
- Optimum. Studia Ekonomiczne (ISSN: 1506-7637)
- Option NV MarketLine Company Profile
- Option/bio (ISSN: 0992-5945,EISSN: 1878-4151)
- Optionable, Inc. MarketLine Company Profile
- Opto Tech Corporation MarketLine Company Profile
- Opto-Electronic Advances (ISSN: 2096-4579)
- Opto-electronics (ISSN: 0030-4077)
- Opto-Electronics Review (ISSN: 1230-3402,EISSN: 1896-3757)
- Optoelectronic and Microelectronic Materials and Devices, Conference on (ISSN: 1097-2137,EISSN: 2377-5505)