| ultra-secret | top secret |
| ultra-sonore | ultrasonic |
| Ultra-violet | Ultraviolet |
| Ultrabithorax | Ultrabithorax |
| UltraEdit | UltraEdit |
| Ultrafiltration | Ultrafiltration |
| ultrafiltre | ultrafilter |
| Ultramarines | Ultramarines |
| ultranationalisme | ultranationalism |
| Ultraportatif | Subnotebook |
| Ultras | Ultras |
| Ultrasauros | Ultrasauros |
| Ultrasaurus | Ultrasaurus |
| ultrasecret | top secret |
| ultrason | ultrasound |
| ultrasonique | ultrasonic |
| ultrasonore | ultrasonic |
| ultrasons | ultrasound |
| Ultrastructurel | Ultrastructural |
| ultraviolet | ultraviolet |
| Ultraïsme | Ultraist movement |
| Ultzama | Ultzama |
| ultérieurement | afterwards |
| Uluburun | Uluburun shipwreck |
| Uludj Ali | Uluç Ali Reis |
| Ulugh Beg | Ulugh Beg |
| Uluru | Uluru |
| Ulva | Ulva |
| Ulva lactuca | Ulva lactuca |
| Ulvila | Ulvila |
| Ulvophyceae | Ulvophyceae |
| Ulyanovsk | Ulyanovsk |
| Ulysse | Odysseus |
| Ulysses | Ulysses |
| Ulysses Simpson Grant | Ulysses S. Grant |
| Um er-Rasas | Um er-Rasas |
| Uma Thurman | Uma Thurman |
| Umag | Umag |
| umami | umami |
| Umar ben Abd al-Aziz | Umar II |
| Umberto Boccioni | Umberto Boccioni |
| Umberto Caligaris | Umberto Caligaris |
| Umberto Eco | Umberto Eco |
| Umberto Giordano | Umberto Giordano |
| Umberto Nobile | Umberto Nobile |
| Umbrello UML Modeller | Umbrello UML Modeller |
| Umbriel | Umbriel |
| UMC | United Microelectronics Corporation |
| Umea IK | Umeå IK |
| Umeboshi | Umeboshi |
| Umek | DJ Umek |
| umeshu | umeshu |
