The UK is not a Schengen state. If you need a visa for the UK, it's separate from a Schengen visa, which is what you would use to enter France. You will have to get a second visa for the UK.

Yes, many travelers require two separate visas for a trip that includes both London and Paris, as the United Kingdom is not part of the Schengen Area. Paris is in France, which follows Schengen visa rules, allowing travelers to move freely between 29 European countries with a single visa. However, the UK maintains its own independent border and immigration system. If your nationality requires a visa for both regions (such as citizens of India, China, or many African nations), you must apply for a UK Standard Visitor Visa and a separate Schengen Visa (issued by the French embassy if Paris is your main destination). Conversely, travelers from countries like the USA, Canada, or Australia typically do not need a visa for short-term tourism in either location, though they may need to apply for an ETA for the UK and an ETIAS for the Schengen Area starting in 2026. Always check your specific passport's requirements at least two months before your trip, as holding a visa for one of these regions does not grant any legal right to enter the other, despite the proximity of the two capital cities.