Template:British U class submarine

First group	Undine Unity Ursula
Second group	Umpire Una Unbeaten Undaunted Union Unique Upholder Upright Urchin Urge Usk Utmost
Third group	Ultimatum Ultor Umbra Unbending Unbroken Unison United Universal Unrivalled Unruffled Unruly Unseen Unshaken Unsparing Unswerving Untamed Untiring Uproar Upstart Usurper Uther Vandal Varangian Varne Vitality Vox P32 P33 P36 P38 P39 P41 P47 P48 P52

Other operators
File:Naval Ensign of Denmark.svg Royal Danish Navy	Springeren
30x15px Free French Naval Forces	Curie
30x15px Royal Hellenic Navy	Amphitriti Xifias
File:Flag of the Netherlands.svg Royal Netherlands Navy	Dolfijn
File:Flag of Norway, state.svg Royal Norwegian Navy	Uredd Ula
File:Naval Ensign of Poland.svg Polish Navy	Dzik Sokół
30x15px Soviet Navy	V-2 V-3 V-4

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