Gemma Jones
Ganwyd	4 Rhagfyr 1942  Marylebone
Dinasyddiaeth	y Deyrnas Unedig
Alma mater	Royal Academy of Dramatic Art
Galwedigaeth	actor llwyfan, actor ffilm
Gwobr/au	Nymff Aur am Actores Eithriadol mewn Ffilm Deledu, British Academy Television Award for Best Supporting Actress

Actores Seisnig yw Gemma Jones (ganwyd Jennifer Jones, 4 Rhagfyr 1942).

Cafodd ei geni yn Llundain, yn ferch i'r actor Cymreig Griffith Jones. Mae hi'n chwaer i'r actor Nicholas Jones.

• The Devils (1971)
• Sense and Sensibility (1995)
• Wilde (1997)
• Bridget Jones's Diary (2001)
• Harry Potter and the Chamber of Secrets (2002)
• Harry Potter and the Half-Blood Prince (2009)
• Merlin (2011)

• Kenilworth (1967)
• The Spoils of Poynton (1971)
• Fall of Eagles (1974)
• The Duchess of Duke Street (1976-1977)
• Inspector Morse (1987)
• Chelworth (1989)
• Ruth Rendell Mysteries (1990)
• The Phoenix and the Carpet (1997)
• Longitude (2000)
• All About George (2005)
• Spooks (2007-2008)