- Lady Diana (s) - Lavender. Harriss, 1985.
- Lady Fairbairn (s) - Pale mauve. Harriss, 1963.
- Lady Grisel Hamilton (g) - Clear lavender, hooded standard. Eckford, 1898.
- Lady Penny (s) - Lavender. 1995.
- Lady Serena James - Synonym of Crown Princess of Prussia.
- Lady Seymour (s) - Dark Blue.
- Lady Susan (s) - Orange-pink. Albutt, 1995.
- Lady Turral (g) - Magenta standard, lilac wings. Turral, 1962.
- Lady's Bonnet (g) - Pale blue, distorted standard. Grayson, 2003.
- Lake Windermere (s) - Two tone blue. 2003.
- Larkspur (s) - Pale blue. pre 1969.
- Laura (s) - Crimson. Walker, 1990.
- Laura Webster (s) - Warm pink. Hammett.
- Lauren Landy (s) - Warm rose, white ground. Harrod, 2010.
- Lavender Glory (e) - Lavender Spencer Praecox.
- Lavender Melody - Synonym of Mary Lou Heard
- Leading Light (s) - Reverse bicolour. Hammett, 2006.
- Leamington (s) - Lavender. Colledge, 1961.
- Ledi (s) - Magenta pink. Adie, 2008.
- Ledston Luck - Synonym of Anthea Turner.
- Leominster Boy (s) - Salmon orange. Beane, 2009.
- Leonard Montague (s) - Salmon cerise with white eye. Harrod.
- Lianne Marie (s) - Magenta. 1995.
- Libra (s) - Salmon pink, white ground. Place, 1999.
- Lightning (g) = Mid blue.
- Lilac Ripple (s) - Lavender stripe, white ground. Thomas, 1989.
- Lilac Romance (s) - Lilac. Wells, 2009.
- Lilac Silk (s) - Pale pink, white ground. 1989.
- Lilac Time - Lavender. 1990.
- Lillie Langtry (s) - Cream.
- Lily Price (s) - Magenta. Walker, 1998.
- Limelight (s) - Ivory, pale green under shade. Rowland 2002.
- Linda C (s) - Mid blue. Chisholm, 2001.
- Linda Carole (s) - Red stripe. 2004.
- Linda Mary (s) - Pink stripe, cream ground. Parsons, 2007
- Linda Richards (s) - Lilac pink flush, cream ground. Parsons, 2011.
- Lipstick(1) - Mid red. Hammett, 2003.
- Lipstick(2) - Vivid carmine. 2008.
- Lisa Marie (s) - Chocolate stripe. Place, 2004.
- Little Black Dress - Synonym of Almost Black
- Little Red Riding Hood (g) - Bicolour. Hammett.
- Lively Lassie (s) - Lavender flush. 2002.
- Liz Bolton (s) - Rose pink. 1982.
- Lizbeth (s) - Orange red. Tremewan, 1993.
- Loch Loman (g) - Maroon. pre 1932.
- Lois (e,m) - Deep rose pink Cuthbertson Florabunda. Cuthbertson.
- Lord Fisher (s) - Maroon. 1915.
- Lord Nelson (g) - Navy blue. House, 1907.
- Lord Nelson Spencer (s) - Navy blue. Holmes, 1913.
- Louise (s) - Salmon pink, cream ground. 1979.
- Lovejoy (s) - Maroon. 1992.
- Lovely Lady (s) - Mid blue. 2002.
- Lucinda Jane (s) - Cerise pink. Entwhistle, 1993.
- Lucy (s) - Salmon pink, cream ground. 1996.
- Lucy Hawthorne (s) - White. 2011.
- Lucy Jane (g) - Purple picotee, cream ground. Grayson, 2004.
- Lunar Sea (e) - Cream. Hammett, 2009.
- Lustre (s) - Magenta. 1979.
- Lynda's Blush (s) - Crimson. Hammett.
- Lynn Davey (s) - Lavender. James, 1998.
- Lynn Fiona (s) - Pale pink, cream ground. Robertson, 2000.