Begum v Home Secretary [2021] UKSC 7 is the short name of three closely connected proceedings considered together in the Supreme Court of the United Kingdom, R (on the application of Begum) v Special Immigration Appeals Commission; R (on the application of Begum) v Secretary of State for the Home Department; and Begum v Secretary of State for the Home Department, concerning Shamima Begum, a woman born in the United Kingdom who at the age of 15 travelled to Syria to join the Islamic State of Iraq and the Levant (ISIS). Her intention to return to England in 2019 resulted in a public debate about the handling of returning jihadists.