Henley Royal Regatta

Henley Royal Regatta is a rowing event held every year on the River Thames by the town of Henley-on-Thames, England. The Royal Regatta is sometimes referred to as Henley Regatta, its original name pre-dating Royal patronage. It should not be confused with the three other regattas rowed over approximately the same course (Henley Women's Regatta, Henley Veterans Regatta and Henley Town and Visitors Regatta), each of which is an entirely separate event.

The regatta lasts for 5 days (Wednesday to Sunday) over the first weekend in July. Races are head-to-head knock out competitions, raced over a course of 1 mile, 550 yards (2,112 m). The regatta regularly attracts international crews to race. The most prestigious event at the regatta is the Grand Challenge Cup for Men's Eights, which has been awarded since the regatta was first staged.

As the regatta pre-dates any national or international rowing organisation, it has its own rules and organisation, although it is recognised by both British Rowing (the governing body of rowing in England and Wales) and FISA (the International Federation of Rowing Associations). The regatta is organised by a self-electing body of Stewards, who are largely former rowers themselves. Pierre de Coubertin modelled elements of the organisation of the International Olympic Committee on the Henley Stewards.

The regatta is regarded as part of the English social season. As with other events in the season, certain enclosures at the regatta have strict dress codes.