Family
- sister Serena Scott Thomas: Born in 1961; known for her portrayal of Dr. Molly Warmflash in the James Bond film "The World Is Not Enough" (1999)
- daughter Hannah Olivennes: Born in 1988; father, François Olivennes
- son Joseph Olivennes: Born in March 1991; father, François Olivennes
- son George Olivennes: Born in September 2000; father, François Olivennes
- father Simon Scott Thomas: Served in the British Royal Navy; died in a flying accident in 1964
- mother Deborah Scott Thomas: Raised in Hong Kong and Africa; remarried to another Royal Navy pilot, who also died in a flying accident six years after the death of her first husband
Companions
- Companion Tobias Menzies: Met while appearing in Chekhov's play "Three Sisters" (2003) in London's West End; no longer together
