Lena Kathren Headey is an English actress. She gained international recognition and acclaim for her portrayal of Cersei Lannister on the HBO fantasy drama series Game of Thrones (2011–2019), for which she received five Primetime Emmy Award nominations and a Golden Globe Award nomination, and Queen Gorgo in 300 (2006).

Cersei Lannister is a fictional character in the A Song of Ice and Fire series of epic fantasy novels by American author George R. R. Martin, and its television adaptation Game of Thrones, where she is portrayed by actress Lena Headey. Introduced in 1996's A Game of Thrones, Cersei is a member of House Lannister, one of the wealthiest and most powerful families on the continent of Westeros. She subsequently appears in A Clash of Kings (1998) and A Storm of Swords (2000), and becomes a prominent point of view character beginning with A Feast for Crows (2005). Cersei will continue to be a point-of-view character in the forthcoming volume The Winds of Winter.