| Giant Size Hostas | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Uberageous' | Blue/Green | Streaked | Yellow | Hybrid | Pure-White | August | Goodenough, Rick | --NR-- |
| 'Ufo' | Dark-Green | Marginal | Yellow | Nat-Sport | Pale-Lavender | July into August | Fransen, Marco | --NR-- |
| 'Uncle Shorty' | Blue/Green | | - | Unknown | Near-White | June into July | Schulz, Ed | .2017 |
| 'Undine' | Dark-Green | | - | Hybrid | Pale-Lavender | June into July | Schuster, Eberhard & Syre-Herz, Ursula | --NR-- |
| 'Unique' | Blue/Green | | - | Hybrid | Light-Purple | - | Fisher, Eunice V. & Ruh, Peter | .1991 |
| 'Uniquely Go Big or Go Home' | Blue/Green | | - | Unknown | - | July into August | Rosenberg, Marlene Miller, Jeff & & Goodrich, Jon | .2014 |
| 'Uniquely Rails to Trails' | Med-Green | | - | Nat-Sport | Pale-Lavender | July into August | Rosenberg, Marlene | --NR-- |
| 'Upbeat' | Med-Green | | - | Hybrid | Pale-Lavender | July | Ruh, Peter | .2000 |
|