| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Sea Gold Dust' | Medium | Light-Green | - | - | Hybrid | Near-White | June into July | Seaver, Mildred & Walek, Kevin | .2009 |
| 'Shironakafu Saikoku Iwa' | Miniature | Med-Green | Medial | Yellow | Unknown | - | - | Unknown | --NR-- |
| 'Shironeko' | Medium | Med-Green | Marginal | White | Unknown | - | - | Unknown | --NR-- |
| 'Silver Bowl' | Large | Blue/Green | - | - | Hybrid | Near-White | June into July | Fisher, Eunice V. & The American Hosta Society | .1986 |
| 'Silver Chalice' | Medium | Yellow | Marginal | White | Sport | Pale-Lavender | July | Elslager, Ed | .2005 |
| 'Silver King' | Large | Blue/Green | - | - | Unknown | Near-White | June into July | Plater-Zyberk, Maria | --NR-- |
| 'Skyrocket' | Large | Yellow | - | - | Sport | Pale-Lavender | July into August | Kuk, Bob | .1999 |
| 'Slim Shady' | Small | Blue/Green | - | - | Sport | - | - | German, Ellen | --NR-- |
| 'Smokey Bear' | Giant | Dark-Green | - | - | Hybrid | Near-White | June into July | Petryszyn, Olga | --NR-- |
| 'South Seas' | Giant | Dark-Green | Medial | Yellow | Hybrid | - | - | Sisson, Kathie | --NR-- |
| 'Spinach Patch' | Large | Med-Green | - | - | Hybrid | Light-Purple | - | Vaughn, Kevin & Walek, Kevin | .2009 |
| 'Squash Casserole' | Large | Yellow | Marginal | Blue-Green | Hybrid | Light-Purple | July | Avent, Tony | .1995 |
| 'Stark Naked' | - | Med-Green | - | - | Unknown | - | - | Stark, Gunther | --NR-- |
| 'Stegeman's Dreadnaught' | Large | Dark-Green | - | - | Hybrid | Pale-Lavender | June into July | Stegeman, Bev & Stegeman, Dave | --NR-- |
| 'Steve Moldovan' | Giant | Blue/Green | - | - | Hybrid | Near-White | June into July | Soucek, Rachel | .2004 |
| 'Stitch In Time' | Small | Yellow | Medial | Green | Sport | Pale-Lavender | July | Mortko, Rob | .2004 |
| 'Stormy Seas' | Large | Dark-Green | - | - | Hybrid | Pale-Lavender | June into July | Zilis, Mark | .2004 |
| 'Substance Abuse' | Large | Med-Green | - | - | Unknown | Pale-Lavender | June into July | Kuk, Bob | --NR-- |
| 'Sultan's Smoke' | Medium | Blue/Green | Marginal | Yellow | Hybrid | Pale-Lavender | June into July | Elslager, Ed | .2001 |
| 'Summer Breeze' | Large | Dark-Green | Marginal | Yellow | TC Sport | Pale-Lavender | July | Zilis, Mark | .1999 |
| 'Sun and Shadow' | Medium | Blue/Green | Medial | Light Green | Sport | Light-Purple | July | Van den Top, Jan | --NR-- |
| 'Susanna' | Medium | Yellow | - | - | Unknown | Med-Lavender | - | Kósa, Lehel | --NR-- |
| 'Sutter's Mill' | Large | Yellow | - | - | Hybrid | Pale-Lavender | June into July | Balitewicz, Bob | --NR-- |
| 'Swamp Monster' | Large | Dark-Green | - | - | Hybrid | Near-White | June | Lachman, Wm & Lachman, Eleanor | .1991 |
| 'Sweet Green' | Large | Dark-Green | Streaked | White | Sport | Near-White | - | Fransen, Marco & Fransen, Joyce & Van den Top, Jan | --NR-- |
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