Emily Mortimer (born 1 December 1971) is an English actress. She began performing on stage, and has since appeared in several film and television roles, including Scream 3 (2000) and Match Point (2005).

Mortimer was born in Finsbury Park, London, England, the daughter of Sir John Mortimer QC (lawyer and dramatist famous for Rumpole of the Bailey) and his second wife Penelope (née Gollop). She has a younger sister, Rosie; two older siblings — Sally Silverman and Jeremy — by her father's first marriage to author Penelope Fletcher, and a half brother, Ross Bentley by her father's liaision with actress Wendy Craig. Her maternal grandfather was a pig farmer.

Mortimer studied at St Paul's Girls' School, where she appeared in several student productions. After St. Paul's, she moved on to Lincoln College, Oxford, where she read Russian, and performed in several plays. Before becoming an actress, Mortimer wrote a column for the Daily Telegraph, and was also screenwriter for a screen adaptation of Lorna Sage's memoir, Bad Blood.