Sabrina Guinness, Lady Stoppard (born 9 January 1955) is the daughter of James Guinness and his wife Pauline, née Mander. She runs the charity Youth Cable Television in London, is an heiress of the Guinness family, and is famous for her contacts in the media world. She was once dubbed "the It Girl of her generation" for her high-profile romantic liaisons.
She established Youth Cable Television in 1995 with the help of Greg Dyke. The charity trains disadvantaged youth to work in television production. Formerly she worked as PA for David Stirling, the founder of the SAS.
Her twin sister Miranda is married to Keith Payne, the designer of rock concert special effects. Her brother Hugo Guinness is an artist and model. In 2014 Sabrina married playwright Sir Tom Stoppard.
- "Guinness 'It Girl' on arts prize shortlist", The Telegraph, June 12, 2000
- Griffiths, Charlotte (7 June 2014). "Tom and 'Goldilocks' tie knot - for real this time!". Daily Mail. Retrieved 8 June 2014.