| ID | Journal Title | ISSN |
Impact Factor |
| 4405 | OBES RES | 1071-7323 | 4.656 |
| 4406 | OBES SURG | 0960-8923 | 1.464 |
| 4407 | OBJECT ORIENTED SYST | 0969-9767 | 2.000 |
| 4408 | OBSERVATORY | 0029-7704 | 0.189 |
| 4409 | OBSTET GYN CLIN N AM | 0889-8545 | 0.670 |
| 4410 | OBSTET GYNECOL | 0029-7844 | 2.091 |
| 4411 | OCCUP ENVIRON MED | 1351-0711 | 2.262 |
| 4412 | OCCUP MED-OXFORD | 0962-7480 | 0.531 |
| 4413 | OCCUP MED-STATE ART | 0885-114X | 0.387 |
| 4414 | OCEAN COAST MANAGE | 0964-5691 | 0.405 |
| 4415 | OCEAN ENG | 0029-8018 | 0.368 |
| 4416 | OCEANOL ACTA | 0399-1784 | 0.662 |
| 4417 | OCEANUS | 0029-8182 | 0.105 |
| 4418 | OCL-OL CORPS GRAS LI | 1258-8210 | 0.108 |
| 4419 | OCUL IMMUNOL INFLAMM | 0927-3948 | 0.814 |
| 4420 | ODONATOLOGICA | 0375-0183 | 0.294 |
| 4421 | OECOLOGIA | 0029-8549 | 2.232 |
| 4422 | OFIOLITI | 0391-2612 | 0.857 |
| 4423 | OHIO J SCI | 0030-0950 | 0.273 |
| 4424 | OIKOS | 0030-1299 | 2.461 |
| 4425 | OIL GAS J | 0030-1388 | 0.095 |
| 4426 | OIL GAS SCI TECHNOL | 1294-4475 | 0.084 |
| 4427 | OIL GAS-EUR MAG | 0342-5622 | 0.019 |
| 4428 | OIL SHALE | 0208-189X | 0.308 |
| 4429 | OMEGA-INT J MANAGE S | 0305-0483 | 0.453 |
| 4430 | ONCOGENE | 0950-9232 | 6.490 |
| 4431 | ONCOL REP | 1021-335X | 1.290 |
| 4432 | ONCOL RES | 0965-0407 | 1.508 |
| 4433 | ONCOLOGY-BASEL | 0030-2414 | 2.584 |
| 4434 | ONCOLOGY-NY | 0890-9091 | 0.933 |
| 4435 | ONDERSTEPOORT J VET | 0030-2465 | 0.691 |
| 4436 | ONKOLOGIE | 0378-584X | 0.640 |
| 4437 | ONLINE CDROM REV | 1353-2642 | 0.206 |
| 4438 | ONLINE INFORM REV | 1468-4527 | |
| 4439 | OPER DENT | 0361-7734 | 1.411 |
| 4440 | OPER RES | 0030-364X | 1.006 |
| 4441 | OPER RES LETT | 0167-6377 | 0.523 |
| 4442 | OPER TECHN SPORT MED | 1060-1872 | 0.606 |
| 4443 | OPHELIA | 0078-5326 | 0.649 |
| 4444 | OPHTHAL PHYSL OPT | 0275-5408 | 0.504 |
| 4445 | OPHTHALMIC PLAST REC | 0740-9303 | 0.699 |
| 4446 | OPHTHALMIC RES | 0030-3747 | 0.773 |
| 4447 | OPHTHALMIC SURG LAS | 0022-023X | 0.775 |
| 4448 | OPHTHALMOLOGE | 0941-293X | 0.536 |
| 4449 | OPHTHALMOLOGICA | 0030-3755 | 0.494 |
| 4450 | OPHTHALMOLOGY | 0161-6420 | 3.040 |
| 4451 | OPT APPL | 0078-5466 | 0.231 |
| 4452 | OPT COMMUN | 0030-4018 | 1.185 |
| 4453 | OPT ENG | 0091-3286 | 0.942 |
| 4454 | OPT EXPRESS | 1094-4087 | 1.811 |
| 4455 | OPT FIBER TECHNOL | 1068-5200 | 1.172 |
| 4456 | OPT LASER ENG | 0143-8166 | 0.208 |
| 4457 | OPT LASER TECHNOL | 0030-3992 | 0.497 |
| 4458 | OPT LETT | 0146-9592 | 2.989 |
| 4459 | OPT MATER | 0925-3467 | 1.165 |
| 4460 | OPT QUANT ELECTRON | 0306-8919 | 0.602 |
| 4461 | OPT REV | 1340-6000 | 0.491 |
| 4462 | OPT SPECTROSC+ | 0030-400X | 0.517 |
| 4463 | OPTIK | 0030-4026 | 0.408 |
| 4464 | OPTIM CONTR APPL MET | 0143-2087 | 0.286 |
| 4465 | OPTIM METHOD SOFTW | 1055-6788 | 0.700 |
| 4466 | OPTOMETRY VISION SCI | 1040-5488 | 1.015 |
| 4467 | OR SPEKTRUM | 0171-6468 | 0.240 |
| 4468 | ORAL MICROBIOL IMMUN | 0902-0055 | 1.419 |
| 4469 | ORAL ONCOL | 0964-1955 | 1.690 |
| 4470 | ORAL SURG ORAL MED O | 1079-2104 | 0.865 |
| 4471 | ORDER | 0167-8094 | 0.132 |
| 4472 | ORE GEOL REV | 0169-1368 | 1.933 |
| 4473 | ORG GEOCHEM | 0146-6380 | 1.390 |
| 4474 | ORG LETT | 1523-7060 | 3.367 |
| 4475 | ORG PREP PROCED INT | 0030-4948 | 0.775 |
| 4476 | ORG PROCESS RES DEV | 1083-6160 | 0.848 |
| 4477 | ORG SYNTH | 0078-6209 | 1.186 |
| 4478 | ORGANOMETALLICS | 0276-7333 | 3.169 |
| 4479 | ORIENT INSECTS | 0030-5316 | 0.216 |
| 4480 | ORIGINS LIFE EVOL B | 0169-6149 | 1.317 |
| 4481 | ORL J OTO-RHINO-LARY | 0301-1569 | 0.624 |
| 4482 | ORNIS FENNICA | 0030-5685 | 0.558 |
| 4483 | ORTHOP CLIN N AM | 0030-5898 | 0.874 |
| 4484 | ORTHOPADE | 0085-4530 | 0.364 |
| 4485 | ORTHOPEDICS | 0147-7447 | 0.472 |
| 4486 | ORYX | 0030-6053 | 0.959 |
| 4487 | OSAKA J MATH | 0030-6126 | 0.208 |
| 4488 | OSIRIS | 0369-7827 | 0.065 |
| 4489 | OSTEOARTHR CARTILAGE | 1063-4584 | 2.080 |
| 4490 | OSTEOPOROSIS INT | 0937-941X | 2.613 |
| 4491 | OSTRICH | 0030-6525 | 0.548 |
| 4492 | OTO RHINO LARYN NOVA | 1014-8221 | 0.083 |
| 4493 | OTOLARYNG CLIN N AM | 0030-6665 | 0.537 |
| 4494 | OTOLARYNG HEAD NECK | 0194-5998 | 0.977 |
| 4495 | OUTLOOK AGR | 0030-7270 | 0.364 |
| 4496 | OXFORD B ECON STAT | 0305-9049 | 0.386 |
| 4497 | OXID COMMUN | 0209-4541 | 0.124 |
| 4498 | OXID MET | 0030-770X | 1.798 |
| 4499 | OZONE-SCI ENG | 0191-9512 | 0.523 |