| Name | Length (m) | Year | Builder |
|---|---|---|---|
| Unfurled | 46 | 2016 | Vitters Shipyard |
| Unforgettable | 29.87 | 1989 | Burger Boat Company |
| Unforgettable | 41.76 | 2003 | Royal Denship A/S |
| Unexpected | 37.7 | 2001 | Heesen Yachts |
| Undici | 28.95 | 2020 | Benetti SpA |
| Undici | 33.53 | 2020 | Riva S.p.A. |
| Unbridled | 28.65 | 2003 | Hargrave Custom Yachts |
| Unbridled | 35.36 | 1995 | Crescent Custom Yachts |
| Unbridled | 58.22 | 2009 | Trinity Yachts |
| UnWined | 34.1 | 2005 | Westport Yachts |
| Umbra | 58 | 2010 | Damen Yachting |
| Um Hurair | 47.78 | 1970 | Benetti SpA |
| Um Alhoul | 71.5 | 2018 | Nakilat Damen Shipyards Qatar Ltd. |
| Ulysses | 52.94 | 1967 | Frederikshavn Værft & Tørdok A/S |
| Ulysses | 39.4 | 2008 | Mondomarine SpA |
| Ulysses | 102.6 | 2024 | Feadship |
| Ultraviolet | 28.1 | 2013 | Sunseeker |
| Ultra G | 60 | 2024 | Heesen Yachts |
| Ultima Novia | 42.6 | 1994 | Sensation Yachts |
| Ultency | 44.5 | 2024 | Sanlorenzo |
| Ulisse | 32.3 | 2000 | Green Marine |
| Ukara | 33.53 | 1994 | Delta Marine |
| Uh Oh | 35.97 | 1990 | Swiftships Inc. |
| Ubiquitous | 34.36 | 2022 | Benetti SpA |
| Ubi Bene | 43.89 | 2010 | Valena Yachting |
| UU | 49.9 | 2021 | Overmarine Group SPA |
| USS Sequoia | 32 | 1925 | Mathis Yacht Building Co |
| UM7 | 28.15 | 2008 | Sunseeker |
| UD30 | 28.15 | 2004 | Sunseeker |
| UAQ 1 | 41.05 | 2013 | Gulf Craft |
| U-81 | 80.1 | 2022 | Damen Shipyards |
| U Wish | 30.98 | 2009 | Leopard Yachts |
| Tyndareo | 42.8 | 1982 | CRN |
| Two Kay | 34 | 2001 | Custom Line |
| Two And a Half Men | 31.57 | 2018 | Arcadia Yachts |
| Twizzle | 57.5 | 2010 | Royal Huisman |
| Twinzz | 32.98 | 2016 | Benetti SpA |
| Twins | 39 | 2024 | Mengi Yay Yachts |
| Twin Dreams | 32.36 | 2022 | Ocean Alexander |
| Twilight II | 38.14 | 2013 | Oyster Yachts |
| Twig | 37.04 | 2017 | Custom Line |
| Twenty Eight | 28.15 | 2012 | Sunseeker |
| Tuyika S | 36.6 | 2009 | Jasmine Yat |
| Tutto Le Marrane | 46.2 | 2011 | Leopard Yachts |
| Tuscan Sun | 32.5 | 2008 | Maiora |
| Turquoise | 49.85 | 1994 | Turquoise Yachts |
| Turnin' Left | 30.2 | 1994 | Broward Marine |
| Turkiz | 33.5 | 2008 | Ned Ship Group |
| Turk's | 36.5 | 2023 | Benetti SpA |
| Turk's | 30.2 | 2006 | Benetti SpA |