- Ramona (e) - Orange flowered EMG variety.
- Raspberry Flake (s) - Flake. 2009.
- Red Ace (s) - Scarlet. Walker, 1997.
- Red Arrow (s) - Bright clear scarlet.
- Red Ensign (s) - Scarlet.
- Red Ripple (s) - Crimson stripe. 2001.
- Remembrance (s) - Crimson.
- Restormel (s) - This fragrant bright cerise variety has long been as the finest red exhibition sweet pea. Tremewan.
- Rhapsody (s) - Orange pink. 1978.
- Richard and Judy (s) - A two tone mauve sweet pea named after British television personalities. 2002.
- Richard Davey (s) - Cerise. Kerton, 1995.
- Robert (e) - Mid blue Cuthbertson Florabunda variety. Cuthbertson.
- Robert Uvedale (s) - Magenta. 2000.
- Rococo (s) - Crimson. 2004.
- Romeo (g) - Small flowered blue picotee sweet pea. Unwin, 2000.
- Ron Entwistle (s) - Scarlet. Grayson, 1999.
- Ronnie (e) - Orange Cuthbertson Florabunda sweet pea. Cuthbertson.
- Roosterville (g) - Small flowered vivid magenta sweet pea. Hammett, 2009.
- Rory K (s) - Lavender. Kerton, 2009.
- Rosalind (s) - Rose pink on cream.
- Rosanna Alice (s) - Mauve picotee on white. 1995.
- Rosemary Padley (s) - A cerise crimson with large flowers. 1995.
- Rosie (s) - Carmine.
- Rosina (s) - A large flowered lavender exhibition sweet pea. James, 1994.
- Rosy Dawn (s) - An orange-cerise flake. 1999.
- Rosy Frills (s) - Pink picotee on a white ground.
- Rouge Parfum - Crimson with good scent. 2005.
- Rowallane (s) - Cerise, aka Jewel. Harrod, 2006.
- Rowena Lynn (s) - Scarlet. Kerton, 2004.
- Roy Castle (s) - A vivid magenta sweet pea of vigorous growth and very long flower stems. Medium scent. 1996.
- Roy Lacey (s) - Pale mauve. 2002.
- Roy Phillips (s) - Scarlet.
- Royal Baby (s) - Lavender.
- Royal (e) - A series of spring flowering sweet peas. Ferry-Morse, 1968.
- Royal Flush (s) - Salmon pink (cream ground). Bolton, 1965.
- Royal Wedding (s) - A pure white sweet pea which was very popular in the 1980s and 1990s, but commercial stocks now appear to be degenerate.
- Ruby Anniversary (s) - Crimson. Sewell, 2000.
- Ruth (e) - Rose pink Cuthbertson Florabunda sweet pea. Cuthbertson.
- Ruth Ellen (s) - Salmon pink on cream ground. Cave, 2006.