False imprisonment describes the unlawful, complete restraint of a person’s freedom of movement without lawful authority or consent. It includes confinement by physical barriers, threats or an asserted legal power, and may occur even for a short period. There must be total restraint within a bounded area; mere obstruction or inconvenience is insufficient.In England & Wales and Northern Ireland, it is a tort and a common law offence developed in case law. The claimant need not be aware of the detention (Murray v Ministry of Defence), and liability can arise despite good faith where no power in fact exists or is misapplied (R v Governor of Brockhill Prison, ex p Evans (No 2)). Common settings include police arrest and custody, prison release-date miscalculations, immigration or mental health detention, hospital or care-home confinement, and private security holds. Remedies include damages (often available for even brief unlawful detention), habeas corpus and judicial review to secure release.In Scotland, the equivalent civil delict is wrongful detention or unlawful deprivation of liberty, with materially similar tests, and corresponding common law crimes. In Ireland, the tort mirrors the common law, and false imprisonment is also a statutory criminal offence (Non-Fatal Offences Against the Person Act 1997). Usage is broadly consistent across these jurisdictions.