- Sagittarius (s) - Orange red. Place, 1999,
- Saint Anne (s) - White. Harrod, 2005.
- Sally Ann (s) - Rose pink, white ground. Brewer, 1998.
- Sally Unwin (s) - Rose pink.
- Salmon Beauty (e) - Salmon Spencer Praecox.
- Sandi Jones (s) - Dark pink. Anbutt, 2003.
- Sandringham (s) - Scarlet. 1992.
- Sarah (s) - Mauve. 1987.
- Sarah Kennedy (s) - Pale pink, white ground. Sewell, 2002.
- Scarlett (g) - Crimson. 2005.
- Scorpio (s) - Mid blue. Place, 1999.
- Sea Wolf (s) - Lavender flush. Tebby.
- Second Honeymoon (s) - Lavender. Harrod, 2006.
- Selana (s) - Magenta.
- Selana (s) - Pink flush, white ground. 1971.
- Senator (g) - Chocolate/purple bicolour stripe. Eckford, 1891.
- Sequoia (e) - Gold and salmon Spencer Praecox.
- Sheena (s) - Bicolour. 1993.
- Sheila Macqueen (s) - Salmon pink, cream ground. 1980.
- Shirley Pink (s) - Salmon pink, cream ground. 1955.
- Shirley Temple (e) - Rose pink Spencer Praecox.
- Sicilian Fuchsia - synonym of Sicilian Pink
- Sicilian Pink (g) - Pink bicolour. Harland, ca.1955.
- Signpost (s) - Bicolour. Hammett.
- Silver Jubilee (s) - Orange-red. 1978.
- Silvia Simonetti (s) - Orange-red. Chisholm, 2006.
- Sincerity (s) - ?. Simons, pre 1971.
- Sir Cliff (s) - Rosy purple. 1999.
- Sir Jimmy Shand (s) - Mauve stripe, white ground. Chisholm, 2008.
- Sir Max Hastings (s) - Light maroon. Kerton, 2009.
- Skylon (s) - Rose pink, white ground. 1952.
- Snow White (s) - White. Entwistle, 1998.
- Snowdonia Park (s) - White. Bailey, 1981.
- Snowlight (s) - White. Harrod.
- Solar Flare (m) - Orange scarlet. Hammett, 2008.
- Solstice (e) - Series of day neutral early varieties. Lemon.
- Solway Sunset (s) - Orange-cerise stripe. Beane, 2000.
- Somerset Lady (s) - Magenta. P.King, 2012.
- Sonia (s) - Pink with magenta veins. Hunt, 1985.
- Sophie (s) - Coral pink. Brackley, 1998.
- Sophisticated Lady (s) - light rose pink. Harrod.
- South Atlantic (s) - Lavender. 1983.
- South Pacific - Apricot. Harrod.
- Southampton (s) - Lavender. B.R.Jones, 1978.
- Southbourne (s) - Pale pink, white ground. Colledge, 1974.
- Souvenir (s) - Lavender. 1996.
- Spaceman (s) - Blue flush acacia leaf. Grayson, 1998.
- Spencer Praecox (e,s) - Series of early varieties.
- Splendor (s) - Orange salmon or Rose pink.
- Spring Sunshine (e) - Series of early cut flower varieties. Rowland.
- Stainless - Pale blue, darker flecks. Grayson, 1993.
- Stardust (s) - Cream. Verge.
- Starlight (s) - Carmine-magenta. Walker, 2004.
- Stella (e,m) - Cream EMG.
- Steve Davis (s) - Cerise. Harriss, 1989.
- Stithians (s) - Pale blue. Tremewan, 1994.
- Stormy Seas (s) - Mid blue. 2010.
- Strawberry Fields (e) - Coral/pink bicolour. Hammett.
- Strawberry Ice (g) - Pale mauve. Parsons, 1998.
- Streamer series (s) - A series of six flakes. Hammett.
- Stylish (s) - Mid blue. Pre 1953.
- Su Pollard (s) - Purple. 1991.
- Subtle Charm (s) - Pale pink, white ground. Albutt, 1995.
- Sunset(1) (s) - Salmon cerise. Unwin, 1972.
- Sunset(2) (s) - Red. 1993.
- Sunset(3) (s) - Red stripe, white ground. 2002.
- Sunsilk (s) - Orange-pink. 1976.
- Super Star (s) - Rose pink.
- Superfine (s) - Salmon pink, white ground. Bolton, 1969.
- Susan Thomas (s) - Blue flake. Parsons.
- Susie (e,m) - Salmon cerise EMG.
- Susy Z (s) - Dark maroon flake. Rowland, 2004.
- Swan Lake (s) - White. 1954.
- Sweetie (d,g) - Series of seven dwarf sweet peas. 2001-04.
- Sylvia (s) - Magenta. 1998.
- Sylvia Ann (s) - White. Tullett, 1997.
- Sylvia Mary (s) - Orange-red. B.R.Jones, 1991.
- Sylvia Moore (s) - Rose pink, cream ground. Albutt, 2000.