U
- UA. UK to Azores 1943
- UC. UK to Curaçao (or New York) (reverse CU)
- UGF. North America to Gibraltar Fast 1942-45 Mid-Atlantic route (reverse GUF)
- UGL. United States to Gibraltar landing craft
- UGS. North America to Gibraltar Slow 1943-45 Mid-Atlantic route (reverse GUS)
- UL. Elbe to Humber 1945 (reverse LU)
- UR. Loch Ewe to Reykjavík (reverse RU)
- US. Australia to Suez 1940-41 (reverse SU)
- UT United States to UK troopship 1943-44 (reverse TU)
Read more about this topic: List Of World War II Convoy Codes