Do you need your passport to go from London to Paris? Yes, you need your passport to go from London to Paris or vice versa. You will go through immigration. This goes for EU residents too, as due to Brexit the UK is no longer in the EU.

Yes, you absolutely need a valid passport to take the Eurostar train from London to Paris. Since the United Kingdom is no longer part of the European Union and was never part of the Schengen Area, there are full border controls between the two countries. Travelers must pass through both British exit checks and French entry immigration (conducted by the Police Aux Frontières) at St Pancras International before boarding the train. In 2026, UK passport holders must ensure their document was issued less than 10 years ago and has at least three months of validity remaining beyond their intended departure date from the EU. Non-EU/UK citizens may also require a visa or an ETIAS/ETA authorization depending on their nationality, making the passport the most critical document for the journey.