Isabella May Ramsey (born September 2003) is an English actor. They are known for their breakthrough role as young noblewoman Lyanna Mormont in the HBO fantasy television series Game of Thrones (2016–2019) and as Ellie in the HBO post-apocalyptic drama series The Last of Us (2023–present). For the latter, they received nominations for a BAFTA Television Award, Golden Globe Award, and two Primetime Emmy Awards.
Ramsey played Mildred Hubble in the CBBC series The Worst Witch (2017–2020), voiced the title role in the Netflix animated series Hilda (2018–2023), and starred in the historical comedy film Catherine Called Birdy (2022), for which they were nominated for the Critics' Choice Movie Award for Best Young Performer. Ramsey's portrayal of Kelsey Morgan in the BBC prison drama Time (2023) earned them the Royal Television Society Award for Female Supporting Actor.