| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Sapporo' | Large | Med-Green | - | - | Hybrid | Light-Purple | July into August | Klose, Heinz | --NR-- |
| 'Scarlet and Gray' | Medium | Dark-Green | - | - | Unknown | - | - | Ruh, Peter & Ruh, Jean | .2010 |
| 'Sea Biscuit' | Medium | Dark-Green | - | - | Unknown | Med-Lavender | June into July | Seaver, Mildred | --NR-- |
| 'Sooner' | Large | Med-Green | Marginal | Yellow | Unknown | - | - | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Sounds of Kinnick' | Small | Blue/Green | Streaked | White | Hybrid | Unknown | Unknown | Kuenster, Rod | --NR-- |
| 'Spartan Arrow' | Small | Med-Green | - | - | Hybrid | Light-Purple | July | Goodwin, Randy | .2000 |
| 'Spartan Gem' | Medium | Med-Green | - | - | Unknown | Pale-Lavender | August to October | Banyai, Pauline | .1989 |
| 'Spartan Glory' | Large | Med-Green | Marginal | White | Hybrid | Near-White | - | Wilkins, Dr Jim | .2000 |
| 'Split Decision' | Large | Dark-Green | - | - | Hybrid | Pale-Lavender | July | Terpening, Kent | --NR-- |
| 'Sportcaster' | Medium | Med-Green | Marginal | Yellow | Hybrid | Pure-White | July | Elslager, Ed | .2004 |
| 'Stan the Man' | Medium | Dark-Green | Marginal | Yellow | Unknown | - | - | Kuk, Bob | --NR-- |
| 'Summer Olympics' | Large | Yellow | - | - | TC Sport | Pale-Lavender | July | Zilis, Mark | .2004 |
| 'Sunbowl' | - | Light-Green | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Super Bowl' | Medium | Yellow | - | - | Hybrid | Near-White | June | Unknown & Zilis, Mark | .2010 |
| 'Surfboard' | Large | Med-Green | Marginal | Yellow | Hybrid | - | July into August | Graves, Butch | .2016 |
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