| Cultivar Name | Plant Size | Origin | Flower Color | Season | Source | Registered |
| 'Kiss Me Kwick and Don't Slobber' | Large | Hybrid | Near-White | June into July | Kwick, Charles | .2017 |
| 'Taunton' | Medium | Hybrid | Near-White | June into July | Gilligan, Madelon | .2017 |
| 'Tea Biscuit' | Medium | Unknown | Pure-White | July | Lydell, Ransom | --NR-- |
| 'Tears of Joy' | Miniature | Sport | Light-Purple | June into July | Black, Paul & Johnson, Thomas & Sebright Gardens | .2005 |
| 'Terre des Hommes' | Small | Unknown | - | - | Bastille, Jocelyne | --NR-- |
| 'Thai Brass' | Large | Unknown | Pale-Lavender | July | Woodroffe, Fleeta Brownell | .1972 |
| 'Theodore Roosevelt' | Large | Unknown | Pale-Lavender | June into July | Sugita, Hajime & Ruh, Peter | .2001 |
| 'Tiffany Tune' | Medium | Hybrid | Deep-Purple | July | Lysne, Rod | .2021 |
| 'Tiffney's Gold Digger' | Large | Sport | Pale-Lavender | July | Dreessen, Jack | .1999 |
| 'Tiny Bubbles' | Small | Hybrid | Pale-Lavender | July into August | Solberg, Robert | .2008 |
| 'Tortifrons' | Small | Sport | Pale-Lavender | September | Maekawa, Dr Fumio & The American Hosta Society | .2002 |
| 'Totally Twisted' | Small | Hybrid | Pale-Lavender | August to October | Scheer, Alttara | --NR-- |
| 'Tour Eiffel' | Small | Unknown | Pale-Lavender | July | Bastille, Jocelyne | --NR-- |
| 'Tremont Ebony Angel' | Medium | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Tristesse' | Large | Hybrid | Med-Lavender | - | Philips, Hugo | .2010 |
| 'True Friends' | Miniature | Unknown | - | - | Unknown | --NR-- |
| 'Tucker Tigers' | Large | Hybrid | Near-White | June | Stephens, Ray | .1993 |
| 'Two Tone' | Small | Sport | Med-Lavender | - | Fransen, Marco & Fransen, Joyce | --NR-- |
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