| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Sabrina' (Bastille) | Small | Dark-Green | - | - | Unknown | Med-Lavender | - | Bastille, Jocelyne | --NR-- |
| 'Sabrina' (Vissers) | Medium | Yellow | - | - | Hybrid | Med-Lavender | July into August | Vissers, Louis | .2016 |
| 'Sam Spade' | Medium | Dark-Green | Marginal | Yellow | Hybrid | Pale-Lavender | August | Schulz, Ed | .2002 |
| 'Sand Pebbles' | Medium | Med-Green | Medial | Yellow | Hybrid | Pale-Lavender | July into August | Lachman, Wm & Lachman, Eleanor & Walek, Kevin | .2009 |
| 'Sand Pebbles Streaked' | Medium | Med-Green | Streaked | White | Sport | Pale-Lavender | July into August | Unknown | --NR-- |
| 'Saturday Night Fever' | Large | Yellow | - | - | Unknown | - | June into July | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Scarlet Empress' | Small | Med-Green | - | - | Unknown | - | - | Malloy, Alex | --NR-- |
| 'Scarlet Pimpernel' | Small | Med-Green | - | - | Unknown | - | - | Malloy, Alex | --NR-- |
| 'Sea Biscuit' | Medium | Dark-Green | - | - | Unknown | Med-Lavender | June into July | Seaver, Mildred | --NR-- |
| 'Sea High Noon' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Shady Lady' | Medium | Med-Green | Marginal | White | Unknown | - | - | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Shall We Dance' | Medium | Dark-Green | Streaked | Yellow | Sport | Med-Lavender | July into August | Ward, Dr Dick & Ward, Jane | .2012 |
| 'Shane' | Small | Med-Green | Marginal | Yellow | Unknown | - | - | Malloy, Alex | --NR-- |
| 'Sharon Stone' | Medium | Blue/Green | Streaked | Yellow | Sport | Light-Purple | September | Van den Top, Jan | --NR-- |
| 'Shazam' | Medium | Dark-Green | Marginal | White | Unknown | Med-Lavender | July | Malloy, Alex | --NR-- |
| 'Shogun' | Large | Med-Green | Marginal | White | Unknown | Pale-Lavender | July | Aden, Paul & Zilis, Mark & The American Hosta Society | .2010 |
| 'Showboat' | Large | Blue/Green | Marginal | White | Hybrid | Pale-Lavender | July | Lachman, Wm & Lachman, Eleanor | .1993 |
| 'Showtime' (Aden) | Large | Med-Green | Marginal | White | Hybrid | Near-White | July | Aden, Paul | .1987 |
| 'Silent Witness' | Medium | Med-Green | Marginal | Green | Hybrid | Deep-Purple | July | Malloy, Alex | .1997 |
| 'Silver Streak' | Small | Med-Green | Medial | White | Unknown | Pale-Lavender | July | Zager, Herbert A. & The American Hosta Society | .1986 |
| 'Silverado' | Small | Blue/Green | Marginal | White | Sport | Med-Lavender | August to October | Kuk, Bob | .1987 |
| 'Simply Irresistible' | Small | Blue/Green | Marginal | Yellow | Sport | Pale-Lavender | July into August | Wasitis, Chick | .2014 |
| 'Singing in the Rain' | Medium | Med-Green | Marginal | Creamy White | Sport | Pale-Lavender | June into July | Falstad, C.H. & Walters Gardens | .2006 |
| 'Sister Act' | Medium | Blue/Green | Medial | Yellow | Sport | Near-White | June into July | Walters Gardens | --NR-- |
| 'Sitting Pretty' | Small | Dark-Green | Medial | Yellow | Hybrid | Light-Purple | July | Aden, Paul | .1987 |
| 'Sky Dancer' | Medium | Blue/Green | - | - | Hybrid | Pale-Lavender | August to September | Van Eechaute, Danny | .2003 |
| 'Skywalker' | Large | Blue/Green | - | - | TC Sport | Near-White | June into July | Zilis, Mark | .2011 |
| 'Sleeping Beauty' | Small | Blue/Green | Marginal | White | Sport | Pale-Lavender | July into August | Walters Gardens | .1997 |
| 'Sleepy Hollow' | Medium | Dark-Green | Marginal | Green | Sport | Pale-Lavender | June into July | Malloy, Alex | .2003 |
| 'Smuggler's Cove' | Medium | Light-Green | - | - | TC Sport | Light-Purple | July | Zilis, Mark | .2009 |
| 'Some Like it Hot' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Sonny Boy' | Large | Dark-Green | - | - | Unknown | - | - | Plater-Zyberk, Maria | --NR-- |
| 'Sophisticated Lady' | Large | Blue/Green | Marginal | Yellow | Hybrid | Pale-Lavender | July | Ward, Dr Dick & Ward, Jane | .2000 |
| 'South Pacific' | Giant | Med-Green | - | - | Unknown | - | - | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Space Odyssey' | Giant | Blue/Green | - | - | Unknown | - | June into July | Soules, Clarence | .1997 |
| 'Spartacus' | Medium | Med-Green | Marginal | White | Sport | Pale-Lavender | - | Hansen, Hans | .2007 |
| 'Special Forces' | Medium | Blue/Green | Streaked | Yellow | TC Sport | Light-Purple | July | Zilis, Mark | .2011 |
| 'Spellbound' | Large | Light-Green | Marginal | White | Hybrid | - | - | Ward, Dr Dick & Ward, Jane | .2005 |
| 'Spirit of St Louis' | Giant | Med-Green | - | - | Hybrid | Near-White | July into August | Cross, Peter | .2006 |
| 'Spitfire' | Medium | Dark-Green | Streaked | Speckles | Hybrid | Light-Purple | July | Malloy, Alex | .2002 |
| 'Stand By Me' | Medium | Blue/Green | Medial | Yellow | Sport | Pale-Lavender | - | Fransen, Marco | --NR-- |
| 'Standing Ovation' | Large | Med-Green | Marginal | Yellow | Hybrid | Light-Purple | June into July | Vaughn, Kevin | .1987 |
| 'Star Struck' | Small | Med-Green | Marginal | Blue-Green | Sport | Med-Lavender | August | Wilkins, Dr Jim & Wilkins, Jill | .1995 |
| 'Star Wars' | Large | Blue/Green | Medial | Yellow | Sport | Near-White | June into July | Balitewicz, Bob | --NR-- |
| 'Stardust Memories' | Medium | Yellow | - | - | Hybrid | Near-White | June into July | Ward, Dr Dick & Ward, Jane | .2014 |
| 'Stargate' | Large | Med-Green | Streaked | Yellow | Sport | Pale-Lavender | July | Wade, Van | --NR-- |
| 'Stargazer' | Small | Med-Green | Marginal | White | Hybrid | Deep-Purple | June into July | Avent, Tony | .2007 |
| 'Still Waters' | Medium | Blue/Green | - | - | Hybrid | - | June | Ward, Dr Dick & Ward, Jane | .2010 |
| 'Stolen Kiss' | Small | Light-Green | Medial | White | TC Sport | Light-Purple | July | Anderson, Jim | --NR-- |
| 'Stormy Weather' | Large | Med-Green | - | - | Hybrid | Deep-Purple | July into August | Johnson, Greg | .2004 |
| 'Suliban' | Medium | Med-Green | Streaked | Yellow | Sport | Pale-Lavender | July into August | Van Eechaute, Danny | .2013 |
| 'Sum Like It Hot' | Large | Light-Green | Streaked | Yellow | Sport | Pale-Lavender | July into August | Elslager, Ed | .2003 |
| 'Summer Solstice' | Large | Med-Green | Marginal | Yellow | Sport | Pale-Lavender | July | Meyer, Bill | --NR-- |
| 'Sundance' | Large | Dark-Green | Marginal | White | TC Sport | Pale-Lavender | - | Walters Gardens | .1984 |
| 'Sundowner' | Giant | Blue/Green | - | - | Sport | Pale-Lavender | July into August | Elslager, Ed | .2005 |
| 'Sunrise Serenade' | Giant | Light-Green | - | - | Unknown | - | June into July | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Sunshine Kid' | Small | Dark-Green | Marginal | Yellow | Hybrid | Light-Purple | July | Aden, Paul | .1980 |
| 'Super Star' | Large | Blue/Green | Streaked | Yellow | Hybrid | Pale-Lavender | July | Elslager, Ed | .2000 |
| 'Surfer Dude' | Large | Med-Green | - | - | Hybrid | Light-Purple | September | Avent, Tony | .2007 |
| 'Surf's Up' (Terpening) | Large | Blue/Green | - | - | Unknown | - | - | Terpening, Kent | --NR-- |
| 'Surf's Up' (Zilis) | Medium | Yellow | - | - | TC Sport | Pale-Lavender | July into August | Zilis, Mark | .2009 |
| 'Swamp Thing' | Medium | Dark-Green | Marginal | Yellow | Hybrid | Light-Purple | July | Avent, Tony | .2005 |
| 'Swan Lake' | Large | Blue/Green | - | - | Hybrid | Pale-Lavender | August | Sugita, Hajime & Ruh, Peter | .1998 |
| 'Sweet Dreams' | Small | Med-Green | Medial | White | TC Sport | Med-Lavender | July | Zilis, Mark & Walek, Kevin | .2009 |
| 'Sybil' | Small | Med-Green | Medial | White | Sport | - | June into July | Pinterics, Michael | .2002 |
| 'Sybl' | Medium | Med-Green | - | - | Hybrid | - | - | Davidson, LeRoy | --NR-- |
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