| Ultimate Earthbound ImmortalLegendary Duelists: Immortal Destiny · 027 | Legendary Duelists: Immortal Destiny | 027 | Rare | €0.07 |
| Ultimate Fire Formation - SeitoCosmo Blazer · 073 | Cosmo Blazer | 073 | Rare | $0.19 |
| Ultimate Fire Formation - SintoFists of the Gadgets · 021 | Fists of the Gadgets | 021 | Secret Rare | $0.28 |
| Ultimate Flagship UrsatronBurst of Destiny · 040 | Burst of Destiny | 040 | Super Rare | €0.04 |
| Ultimate Flame SwordsmanMaze of Millennia · 004 | Maze of Millennia | 004 | Super Rare | €0.42 |
| Ultimate FusionBattle of Chaos · 051 | Battle of Chaos | 051 | Super Rare | €0.10 |
| Ultimate Great InsectPhoton Hypernova · 035 | Photon Hypernova | 035 | Super Rare | €0.11 |
| Ultimate Insect LV1Soul of the Duelist · 005 | Soul of the Duelist | 005 | Rare | €0.40 |
| Ultimate Insect LV3Rise of Destiny · 007 | Rise of Destiny | 007 | Rare | €0.40 |
| Ultimate Insect LV5Flaming Eternity · 007 | Flaming Eternity | 007 | Rare | €2.18 |
| Ultimate Insect LV7The Lost Millennium · 010 | The Lost Millennium | 010 | Super Rare | $1.43 |
| Ultimate Leo Utopia RayBrothers of Legend · 027 | Brothers of Legend | 027 | Secret Rare | €0.28 |
| Ultimate Obedient FiendMagician's Force · 082 | Magician's Force | 082 | Short Print | €0.10 |
| Ultimate OfferingStarter Deck: Kaiba · 050 | Starter Deck: Kaiba | 050 | Common | €0.02 |
| Ultimate ProvidenceBreakers of Shadow · 081 | Breakers of Shadow | 081 | Secret Rare | €0.14 |
| Ultimate SkyUnlisted Printings | Unlisted Printings | — | — | — |
| Ultimate SlayerPower of the Elements · 067 | Power of the Elements | 067 | Secret Rare | $0.26 |
| Ultimate TyrannoPower of the Duelist · 020 | Power of the Duelist | 020 | Super Rare | €0.10 |
| Ultimaya TzolkinWeekly Shonen Jump April 2015 membership promotional card · 072 | Weekly Shonen Jump April 2015 membership promotional card | 072 | Ultra Rare | €0.22 |
| Ultimeat OfferingThe Lost Art Promotion 2024 · 071 | The Lost Art Promotion 2024 | 071 | Ultra Rare | €0.07 |
| Ultra Beetrooper Absolute HerculesBurst of Destiny · 088 | Burst of Destiny | 088 | Ultra Rare | $0.10 |
| Ultra Evolution PillInvasion of Chaos · 097 | Invasion of Chaos | 097 | Rare | €0.10 |
| Ultra PolymerizationMaximum Crisis · 052 | Maximum Crisis | 052 | Secret Rare | €1.09 |
| Umbral Horror GhostPrimal Origin · 010 | Primal Origin | 010 | Common | $0.16 |
| Umbral Horror GhoulJudgment of the Light · 012 | Judgment of the Light | 012 | Common | €0.10 |
| Umbral Horror Mirage TokenUnlisted Printings | Unlisted Printings | — | — | — |
| Umbral Horror UnformJudgment of the Light · 013 | Judgment of the Light | 013 | Common | €0.09 |
| Umbral Horror Will o' the WispJudgment of the Light · 014 | Judgment of the Light | 014 | Common | €0.11 |
| Umbral SoulStrike of Neos · 030 | Strike of Neos | 030 | Common | €0.13 |
| Umbramirage the Elemental LordCybernetic Horizon · 019 | Cybernetic Horizon | 019 | Super Rare | $0.12 |
| UmiLegend of Blue Eyes White Dragon · 050 | Legend of Blue Eyes White Dragon | 050 | Common | €0.02 |
| UmiirukaMagic Ruler · 097 | Magic Ruler | 097 | Short Print | €0.05 |
| UminotaurusAbyss Rising · 095 | Abyss Rising | 095 | Rare | $0.13 |
| Unacceptable ResultBattles of Legend: Hero's Revenge · 020 | Battles of Legend: Hero's Revenge | 020 | Ultra Rare | €0.04 |
| Unauthorized Bootup DeviceRise of the Duelist · 027 | Rise of the Duelist | 027 | Common | €0.03 |
| Unauthorized ReactivationStructure Deck: Mechanized Madness · 041 | Structure Deck: Mechanized Madness | 041 | Super Rare | $0.83 |
| Unbreakable SpiritBattle Pack 3: Monster League · 234 | Battle Pack 3: Monster League | 234 | Common | €0.07 |
| Unbreakable Xyz BarrierBattles of Legend: Glorious Gallery · 135 | Battles of Legend: Glorious Gallery | 135 | Ultra Rare | €0.08 |
| Unchained AbominationChaos Impact · 045 | Chaos Impact | 045 | Ultra Rare | €0.46 |
| Unchained Enma Lord YamaUnlisted Printings | Unlisted Printings | — | — | — |
| Unchained Malevolent Magistrate KamuraUnlisted Printings | Unlisted Printings | — | — | — |
| Unchained Ogre SharaUnlisted Printings | Unlisted Printings | — | — | — |
| Unchained Ogre ShmaUnlisted Printings | Unlisted Printings | — | — | — |
| Unchained Soul Lord of YamaDuelist Nexus · 049 | Duelist Nexus | 049 | Ultra Rare | $7.43 |
| Unchained Soul of AnguishChaos Impact · 044 | Chaos Impact | 044 | Secret Rare | €0.17 |
| Unchained Soul of DisasterChaos Impact · 010 | Chaos Impact | 010 | Secret Rare | €0.21 |
| Unchained Soul of RageChaos Impact · 043 | Chaos Impact | 043 | Secret Rare | $0.12 |
| Unchained Soul of SharvaraDuelist Nexus · 019 | Duelist Nexus | 019 | Common | €0.16 |
| Unchained Soul of ShyamaDuelist Nexus · 020 | Duelist Nexus | 020 | Common | €0.03 |
| Unchained Soul Rage AbominatorUnlisted Printings | Unlisted Printings | — | — | — |