| Cultivar Name | Plant Size | Origin | Flower Color | Season | Source | Registered |
| 'Nagaba Musashino' | Medium | Unknown | Light-Purple | August to September | Unknown | --NR-- |
| 'Nagaeto' | Medium | Unknown | Light-Purple | - | Ruh, Peter & Ruh, Jean | .2010 .2018 |
| 'Nagasu' | Miniature | Unknown | - | - | Fukatsu, Shinya | --NR-- |
| 'Nakafu Kiyosumi' | Medium | Sport | Pale-Lavender | July | Unknown | --NR-- |
| 'Nakafu Nagaba Mizu' | Miniature | Sport | Pale-Lavender | September | Unknown | --NR-- |
| 'Nakaimo' | Large | Hybrid | Med-Lavender | July | Imperial Botanic Garden Tokyo & The American Hosta Society | .1986 |
| 'Nakota' | Large | Unknown | - | - | Wade, Van | --NR-- |
| 'Nameoki' | Medium | Unknown | - | - | Hensen, Karel | --NR-- |
| 'Namichidori' (Japan) | Medium | Unknown | Light-Purple | August | Unknown | --NR-- |
| 'Nancy' | Small | Unknown | Pale-Lavender | August | Tower, Alan | .2005 |
| 'Nancy Gill' | Large | Hybrid | Pale-Lavender | August | Vaughn, Kevin & Walek, Kevin | .2009 |
| 'Nancy Lindsay' | Large | Sport | Pale-Lavender | July | British Hosta and Hemerocallis Society | .1988 |
| 'Nano' | Miniature | Hybrid | Near-White | June into July | Gilligan, Madelon | .2017 |
| 'Naomi' | Small | Unknown | - | July into August | Klose, Heinz & Ruh, Peter | .2006 |
| 'Naseweiss' | Medium | Unknown | Near-White | - | Kohlein, Fritz | --NR-- |
| 'Nashty Business' | Large | Unknown | Med-Lavender | - | Nash, Bill | --NR-- |
| 'Nate the Great' | Large | Hybrid | Pale-Lavender | July into August | Solberg, Robert | .2003 |
| 'Nathan's Legacy' | Small | Unknown | - | July into August | Zolock, Steve & Zolock, Sarah | .2007 |
| 'National Velvet' | Medium | Sport | Med-Lavender | August | Kuk, Bob | .1990 |
| 'Navajo' | Large | Unknown | Light-Purple | July | Wade, Van | .2007 |
| 'Needle Point' | Small | Unknown | Near-White | July | Jones, Sam | --NR-- |
| 'Neelix' | Medium | Unknown | - | - | Dupre, Dirk | --NR-- |
| 'Nellie Grey' | Small | Hybrid | Pale-Lavender | July into August | Malloy, Alex | .2002 |
| 'Nello and Patrasche' | Medium | Hybrid | - | August to September | Philips, Hugo | .2010 |
| 'Nesmith Giant' | Giant | Hybrid | Near-White | June | Nesmith, Elizabeth & Ruh, Peter | .1994 |
| 'Neulpureum1' | Small | Hybrid | - | - | Korean National Arboretum | --NR-- |
| 'Neutron Star' | Miniature | Sport | Pale-Lavender | June into July | McWilliams, Robb & Philips, Hugo | .2011 |
| 'New Wave' | Medium | Hybrid | Pale-Lavender | July | Lohman, Doug & Zilis, Mark | .1988 |
| 'Nezperce' | Medium | Unknown | - | - | Wade, Van | --NR-- |
| 'Ngaire Dawn' | Large | Hybrid | Near-White | July into August | Gilligan, Madelon | .2013 |
| 'Niagara Falls' | Giant | Hybrid | Pale-Lavender | July | Brincka, Wm & Petryszyn, 0lga | .1991 |
| 'Nick Balash' | Medium | Unknown | Light-Purple | July into August | Owens, Clarence | .1994 |
| 'Nicola' | Medium | Hybrid | Light-Purple | August | Eason, Alan | .1984 |
| 'Nicole' | Small | Unknown | - | - | Unknown | --NR-- |
| 'Nikazaki Mizu' | Medium | Sport | Light-Purple | - | Unknown | --NR-- |
| 'Nina Ricci' | Small | Unknown | - | - | Unknown | --NR-- |
| 'Nina Smiles' | Medium | Unknown | - | - | Unknown | --NR-- |
| 'Nine Nine Nine' | Large | Unknown | - | August to September | Freeman, Franc | .2012 |
| 'Nippers' | Medium | Hybrid | Pale-Lavender | July | Goodenough, Rick | .2006 |
| 'Noah's Ark' | Large | Unknown | Near-White | June into July | Hatfield, Handy & Walek, Kevin | .2009 |
| 'Noble Nirvana' | - | Hybrid | - | - | Unknown | --NR-- |
| 'Nokogiriyama' | Large | Unknown | Pale-Lavender | July into August | Unknown & Ruh, Peter | .2006 .2018 |
| 'Nooks and Crannies' | Large | Unknown | Pure-White | July | Sawyer, Rick | --NR-- |
| 'North Bay Nugget' | Large | Unknown | - | - | Vaillancourt, Caryl | --NR-- |
| 'Nuked' | Medium | Unknown | Pale-Lavender | - | Williams, Glenn | --NR-- |
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