| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Ragtime' | Large | Yellow | - | - | Hybrid | Pale-Lavender | June into July | Ward, Dr Dick & Ward, Jane | .2013 |
| 'Rainmaker' | Giant | Med-Green | - | - | Unknown | - | June into July | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Ralph Dietrick' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Rare Breed' | Medium | Med-Green | Medial | White | Hybrid | Near-White | June into July | Livingston, Ron & The American Hosta Society | .2019 |
| 'Rebel Rouser' | Medium | Yellow | - | - | Hybrid | Near-White | July | Wasitis, Chick | --NR-- |
| 'Red October' | Medium | Dark-Green | - | - | Hybrid | Light-Purple | September to October | Herold, Roy & Walek, Kevin | .2009 |
| 'Red River' | Small | Dark-Green | - | - | Hybrid | - | - | Malloy, Alex | --NR-- |
| 'Red Ryder' | Small | Med-Green | Streaked | White | Hybrid | Pale-Lavender | July into August | Malloy, Alex | .2001 |
| 'Risky Business' | Large | Dark-Green | Medial | White | Sport | Pale-Lavender | July | Hansen, Hans | .2002 |
| 'Rolling Thunder' | Large | Blue/Green | - | - | Unknown | Near-White | June into July | Brashear, Carol | --NR-- |
| 'Rosebud' | Large | Med-Green | - | - | Unknown | - | July | Savory, Dennis | .1992 |
| 'Rosedale Firefly' | Large | Yellow | - | - | Unknown | - | - | Hadrava, Jerry | --NR-- |
| 'Rosedale Houdini' | Medium | Med-Green | Streaked | Yellow | Hybrid | Light-Purple | July into August | Hadrava, Jerry | .2000 |
| 'Route 66' | Large | Yellow | - | - | TC Sport | - | July into August | Zilis, Mark | .2005 |
| 'Roxsanne' | Large | Light-Green | - | - | Sport | Med-Lavender | July | Heemskerk, Gerardus | .2005 |
| 'Ruby Slippers' | Medium | Med-Green | - | - | Hybrid | Light-Purple | September | Ward, Dr Dick & Ward, Jane | .1999 |
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