The UK capital was number one in the world, in Europe and in the UK in a survey of world travellers by the TripAdvisor company.
In the world list, New York was second, Rome third and Paris fourth.
Rome was second and Paris third in the best European destination list, with Dublin in ninth place and Edinburgh 13th.
In the list of best UK destinations, Edinburgh was second, Liverpool third and Torquay in Devon fourth.
TripAdvisor spokeswoman Emma Shaw said: "To be crowned the world's best destination in the Olympic year by millions of travellers is a tremendous honour for London.
"It's fantastic to see the capital recognised and rewarded by those that have really experienced the... read more