Lyndsey Marshal is an English actress best known for her performance in The Hours, and as the recurring character Cleopatra on HBO's Rome, and as Lady Sarah Hill in BBC period drama Garrow's Law.

The Hours is a 2002 psychological drama film directed by Stephen Daldry and starring Meryl Streep, Julianne Moore, and Nicole Kidman. Supporting roles are played by Ed Harris, John C. Reilly, Stephen Dillane, Jeff Daniels, Miranda Richardson, Allison Janney, Toni Collette, Claire Danes, and Eileen Atkins. The screenplay by David Hare is based on Michael Cunningham's 1999 Pulitzer Prize-winning novel of the same name.