The Defender Burghley Horse Trials is an annual three-day event held at Burghley House near Stamford, Lincolnshire, England, currently in early September. Defender Burghley Horse Trials is classified by the FEI as one of the seven leading three-day events in the world (the others being the Badminton Horse Trials, the Kentucky Three-Day Event, the Australian International Three Day Event, the Luhmühlen Horse Trials, the Maryland 5* and the Étoiles de Pau). It has competition at CCI5*-L (five star) level. The prize for first place is currently £110,000. Prize money is given down to 20th place.
Burghley is also one of the three events in the Grand Slam of Eventing.
Run in conjunction with the event since 1990 is the Dubarry Burghley Young Event Horse final, which judges four- and five-year-old horses on their potential as future Olympic mounts.