Lena Kathren Headey (born October 3, 1973) is a British actress. She gained international recognition and acclaim for her portrayal of Cersei Lannister on the HBO epic fantasy drama series Game of Thrones (2011–2019), for which she received five Primetime Emmy Award nominations and a Golden Globe Award nomination.

Headey made her film debut in the mystery drama Waterland (1992). She continued to work steadily in British and American films and on television, before gaining further recognition with her lead performances in the films The Brothers Grimm (2005) and 300 (2007). Her other film credits include The Remains of the Day (1993), The Jungle Book (1994), Mrs Dalloway (1997), Ripley's Game (2002), Imagine Me & You (2005), Dredd (2012), The Purge (2013), 300: Rise of an Empire (2014), Pride and Prejudice and Zombies (2016), and Fighting with My Family (2019).