| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Ocean Dusk' | - | - | - | - | Unknown | - | - | Moore, Jeff | --NR-- |
| 'Ocean Isle' | Large | Blue/Green | Marginal | Yellow | Sport | Pale-Lavender | July | Chopko, Dave | .2006 |
| 'Ocean Isle Twist' | Medium | Dark-Green | Medial | White | Sport | Pale-Lavender | July into August | Chopko, Dave | --NR-- |
| 'Ocean Tide' | Large | Blue/Green | - | - | Hybrid | Near-White | June into July | Mondt, Manfred | --NR-- |
| 'Oceans Blue' | Large | Blue/Green | - | - | Unknown | - | July into August | Schmidt, Bevie | .2009 |
| 'Oder' | Medium | Blue/Green | - | - | Unknown | Med-Lavender | July into August | Klose, Heinz | --NR-- |
| 'Ohio River' | Medium | Med-Green | - | - | Hybrid | - | - | Beilstein, Doug & Malloy, Alex | --NR-- |
| 'Okefenokee' | Medium | Med-Green | Marginal | Yellow | Sport | Pale-Lavender | July into August | Benedict, Dr Ralph (Herb) & Walek, Kevin & The American Hosta Society | .2009 |
| 'Outer Banks' | - | Blue/Green | Streaked | White | Hybrid | - | - | Goodenough, Rick | --NR-- |
|