Isobel Dorothy Powley Boothis an English actress. Born and raised in London, Powley was educated at Holland Park School. She began acting as a teenager on television, starring on the CBBC action television series M.I. High (2007–2008).
Powley gained critical praise for her portrayal of Princess Margaret in A Royal Night Out (2015), for which she was nominated for the British Independent Film Award for Most Promising Newcomer, and a sexually confused teenager in the coming-of-age film The Diary of a Teenage Girl (2015), for which she was nominated for the Independent Spirit Award for Best Female Lead and won the Trophée Chopard at the 2016 Cannes Film Festival.
On television, Powley starred in the National Geographic miniseries A Small Light (2023). For her performance as Miep Gies, Powley received critical acclaim and was nominated for a Critics' Choice Television Award and Screen Actors Guild Award.
