| U.S. Army Medical Department journal | U.S. ARMY MEDICAL DEPARTMENT JOURNAL | 1524-0436 |
| Ubezpieczenia Społeczne. Teoria i praktyka. | UBEZPIECZENIA SPOŁECZNE. TEORIA I PRAKTYKA. | 1731-0725 |
| Ubezpieczenia W Rolnictwie. Materiały i Studia | | 1507-4757 |
| Ubiquitous Learning | UBIQUITOUS LEARNING | 1835-9795 |
| Uchenye Zapiski Kazanskogo Universiteta-Seriya Estestvennye Nauki | UCHENYE ZAPISKI KAZANSKOGO UNIVERSITETA-SERIYA ESTESTVENNYE NAUKI | 2542-064X |
| Uchenye Zapiski Kazanskogo Universiteta-Seriya Fiziko-Matematicheskie Nauki | UCHENYE ZAPISKI KAZANSKOGO UNIVERSITETA-SERIYA FIZIKO-MATEMATICHESKIE NAUKI | 2541-7746 |
| UCJC Business and Society Review | UCJC BUSINESS AND SOCIETY REVIEW | 2659-3270 |
| UCLA Law Review | UCLA LAW REV | 0041-5650 |
| Udar MÓzgu - Problemy Interdyscyplinarne (interdyscyplinary Problems of Stroke) | | |
| Udar Mózgu. Problemy Interdyscyplinarne | | 1505-6740 |
| Uddannelseshistorie | | 0900-226X |
| Ufa Mathematical Journal | UFA MATHEMATICAL JOURNAL | 2074-1863 |
| Ugeskrift for Laeger | UGESKRIFT FOR LAEGER | 0041-5782 |
| Ugol | UGOL | 0041-5790 |
| Ugolovnaya yustitsiya | UGOLOVNAYA YUSTITSIYA | 2308-8451 |
| UHOD-Uluslararasi Hematoloji-Onkoloji Dergisi | UHOD-ULUSLAR HEMATOL | 1306-133X |
| Uirusu. Journal of virology | UIRUSU. JOURNAL OF VIROLOGY | 0042-6857 |
| UIS Ingenierias | UIS INGENIERIAS | 1657-4583 |
| Új Forrás | | 0133-5332 |
| Új Pedagógiai Szemle (formerly: Pedagógiai Szemle) | | 1215-1807 |
| Új Symposion | | 0503-0935 |
| Ukrainian biochemical journal | UKRAINIAN BIOCHEMICAL JOURNAL | 2409-4943 |
| Ukrainian Food Journal | UKRAINIAN FOOD JOURNAL | 2304-974X |
| Ukrainian Geographical Journal | UKRAINIAN GEOGRAPHICAL JOURNAL | 1561-4980 |
| Ukrainian Journal of Ecology | UKRAINIAN JOURNAL OF ECOLOGY | 2520-2138 |
| Ukrainian Journal of Physical Optics | UKR J PHYS OPT | 1609-1833 |
| Ukrainian Journal of Physics | UKRAINIAN JOURNAL OF PHYSICS | 2071-0186 |
| Ukrainian Mathematical Journal | UKR MATH J+ | 0041-5995 |
| Ukrainian Metrological Journal | UKRAINIAN METROLOGICAL JOURNAL | 2306-7039 |
| Ukrainskyi Istorychnyi Zhurnal | | 0130-5247 |
| Ulster Journal of Archaeology | | 0082-7355 |
| Ulster Medical Journal | ULSTER MEDICAL JOURNAL | 0041-6193 |
| Ultramicroscopy | ULTRAMICROSCOPY | 0304-3991 |
| Ultraschall in der Medizin | ULTRASCHALL MED | 0172-4614 |
| Ultrasonic Imaging | ULTRASONIC IMAGING | 0161-7346 |
| Ultrasonics | ULTRASONICS | 0041-624X |
| Ultrasonics Sonochemistry | ULTRASON SONOCHEM | 1350-4177 |
| Ultrasonografia | | 1429-7930 |
| Ultrasonography | ULTRASONOGRAPHY | 2288-5919 |
| Ultrasound | ULTRASOUND | 1742-271X |
| Ultrasound in Medicine and Biology | ULTRASOUND MED BIOL | 0301-5629 |
| Ultrasound in Obstetrics and Gynecology | ULTRASOUND OBST GYN | 0960-7692 |
| Ultrasound International Open | ULTRASOUND INTERNATIONAL OPEN | 2509-596X |
| Ultrasound Journal | ULTRASOUND JOURNAL | 2524-8987 |
| Ultrasound Quarterly | ULTRASOUND Q | 0894-8771 |
| Ultrastructural Pathology | ULTRASTRUCT PATHOL | 0191-3123 |
| Uludag Aricilik Dergisi | ULUDAG ARICILIK DERGISI | 1303-0248 |
| Ulusal Travma ve Acil Cerrahi Dergisi-Turkish Journal of Trauma & Emergency Surgery | ULUS TRAVMA ACIL CER | 1306-696X |
| Uluslararası Afro-Avrasya Araştırmaları Dergisi | ULUSLARARASI AFRO-AVRASYA ARAŞTIRMALARI DERGISI | 2602-215X |
| Uluslararasi Iliskiler-International Relations | ULUSLAR ILISKILER | 1304-7310 |
