| Nowhere Nowhere | 38.35 | 2019 | Custom Line |
| Nowhere Nowhere | 29.9 | 2019 | Riva S.p.A. |
| Noya Hill | 34.75 | 1997 | Crescent Custom Yachts |
| Noyata | 38.2 | 2023 | Azimut Yachts |
| Nueve9 | 35.46 | 2010 | Azimut Yachts |
| Numarine 105HT/01 | 32.94 | 2017 | Numarine |
| Number Nine | 45 | 1989 | Carp Navi |
| Numero Dix | 28.43 | 2023 | Custom Line |
| Nuri | 40.51 | 2021 | Cantiere delle Marche (CdM) |
| Nurja | 41 | 2008 | Abeking & Rasmussen |
| Nurten A | 31 | 1998 | Kadir Turhan |
| Nusr | 30.1 | 2022 | South Red Sea Shipyard |
| Nyala | 35.9 | 1997 | Hatteras Yachts |
| Nyala of Africa | 27.6 | 2013 | Sanlorenzo |
| Nyala of Africa | 35.75 | 2023 | Sanlorenzo |
| Nyima | 32.25 | 2003 | Holland Jachtbouw |
| Nyla | 31.71 | 2015 | Mengi Yay Yachts |
| Nympha | 32 | 2009 | Cantiere Navale De Cesari A. S.N.C. |
| Nymphaea | 32.92 | 1984 | Broward Marine |
| Nympheas | 79 | 2025 | Turquoise Yachts |
| Nyumba GT | 31.24 | 2023 | Southern Wind |
| O | 33.6 | 2014 | Sanlorenzo |
| O | 27.9 | 2010 | Bandido |
| O Mimi | 29.87 | 2021 | Ocean Alexander |
| O'Lion | 42.6 | 2010 | CRN |
| O'Mathilde | 55.6 | 2018 | Golden Yachts Ltd. |
| O'Natalina | 58.5 | 1985 | Picchiotti |
| O'Neiro | 52.7 | 2008 | Golden Yachts Ltd. |
| O'Neiro | 36.13 | 2023 | Golden Yachts Ltd. |
| O'Pari | 95 | 2020 | Golden Yachts Ltd. |
| O'Pati | 39.47 | 2011 | Golden Yachts Ltd. |
| O'Ptasia | 85 | 2018 | Golden Yachts Ltd. |
| O'Remington | 28 | 1946 | Cantiere di Donna |
| O'Riana | 32.96 | 2024 | Golden Yachts Ltd. |
| O'Rion | 41 | 2004 | |
| O4 | 28.49 | 2019 | Riva S.p.A. |
| OK | 146 | 1982 | Oshima Shipbuilding Co Ltd |
| Oak | 34.95 | 2005 | Benetti SpA |
| Oasis | 28.15 | 2012 | Sunseeker |
| Oasis | 29.41 | 2010 | Princess Yachts |
| Oasis | 63 | 2006 | Lürssen Yachts |
| Oasis | 47.5 | 2006 | ISA Yachts |
| Obsession | 28.47 | 2017 | Viking Yachts |
| Obsession | 41.05 | 2013 | Gulf Craft |
| Obsession | 32.92 | 2022 | Hargrave Custom Yachts |
| Obsession | 30.7 | 2000 | Falcon Yachts S.r.l. |
| Obsession II | 34.2 | 2002 | CIM - Constructions Industrielles et Maritimes |
| Obsessions | 38.34 | 1996 | Heesen Yachts |
| Obsidian | 30.15 | 2004 | Azimut Yachts |
| Obsidian | 84.2 | 2023 | Feadship |
