Yes, U.S. citizens do need a visa to live, work, or study in the United Kingdom. While Americans can visit the UK as tourists for up to six months without a visa, this "visitor status" strictly prohibits living there long-term, working (even remotely for a U.S. company in some cases), or accessing public funds like the NHS for free. To legally "live" in the UK, you must apply for a specific residency visa. The most common routes include the Skilled Worker Visa (which requires a job offer from a UK employer licensed to sponsor), the Student Visa (for those enrolled in a UK university), or a Family Visa (if you are married to or in a long-term relationship with a UK citizen or settled person). In 2026, the UK's points-based immigration system is very rigid, and applications can be expensive, often requiring a "Health Surcharge" payment of several hundred pounds per year. It is also important to note that from 2025/2026, even for short visits, U.S. citizens will need to apply for an ETA (Electronic Travel Authorisation) before flying, though this is a travel permit, not a residency visa.