Sandown Park is a horse racing course and leisure venue in Esher, Surrey, England, located in the outer suburbs of London. It hosts 5 Grade One National Hunt races and one Group 1 flat race, the Eclipse Stakes. It regularly has horse racing during afternoons, evenings and on weekends, and also hosts many non-racing events such as trade shows, wedding fairs, toy fairs, car shows and auctions, property shows, concerts, and even some private events. It was requisitioned by the War Department from 1940 to 1945 for World War II.

The venue has hosted bands such as UB40, Madness, Girls Aloud, Spandau Ballet and Simply Red. The racecourse is close to Esher railway station, served by trains from London Waterloo. There is a secondary exit from Esher station which is open on race days, this exit leads directly into the racecourse and Lower Green, Esher.

Sandown Park was the site of a priory built by Henry II. All the occupants died of plague in 1349. Later, a hospital was built there, and when this was demolished, the land was absorbed into Sandown Farm. Lieutenant Colonel Owen Williams bought the land from Mr J.W. Spicer. The colonel had a younger brother, Hwfa (pronounced 'Hoofer'), who realised that it was an ideal site for horse racing.

Hwfa Williams was clerk of the course at Sandown for about fifty years.

In 1903, Mr F.H. Bayles praised Sandown in his book, The Race Courses of Great Britain and Ireland, stating: "A movement for the betterment of English racing by the introduction of an enclosed meeting at Esher in Surrey, close by the Royal residence at Claremont, instituted in 1875, was the harbinger of racecourse reform; with the result that it has induced society to bestow upon it its patronage, by burying the bad reputation of many of its predecessors."

Society did patronise Sandown Park, including the Prince of Wales who won the Eclipse Stakes in 1897 with Persimmon, and in 1900 with Diamond Jubilee.

Sandown Park was one of the first courses to charge all for attending. It opened in 1875 and everyone had to pay at least half a crown. The first meeting was a mixed flat and jumps meeting over three days, starting on Thursday 22 April, and included the Grand National Hunt Chase, now staged at the Cheltenham Festival. The Grand International Steeple Chase took place on the Saturday, worth £2,130 to the winner, and was the largest prize for a steeplechase that season, unusually even eclipsing that for the Liverpool Grand National.

In 1875, Sandown became the first course in England to have a members' enclosure.