Santa Anita Park is a Thoroughbred racetrack in Arcadia, California, United States. It offers some of the prominent horse racing events in the United States during early fall, winter and in spring. The track is home to numerous prestigious races, including both the Santa Anita Derby and the Santa Anita Handicap. It has also hosted the year-end Breeders' Cup races eleven times, more than any other racetrack. In 1984, Santa Anita was the site of equestrian events at the 1984 Olympics and will host once again in 2028. Since 2011, the Stronach Group are the current owners.

"Rancho Santa Anita" was owned originally by former San Gabriel Mission Mayor-Domo, Claudio Lopez, and named after a family member, "Anita Cota". The ranch was later acquired by rancher Hugo Reid, a Scotsman. The property's most widely known owner would be multimillionaire Lucky Baldwin, a successful businessman in San Francisco who greatly enhanced his wealth through an investment in the famous Comstock Lode. Baldwin became a successful breeder and owner of Thoroughbred racehorses and in 1904 built a racetrack adjacent to the present site. On February 4, 1909 the California State Legislature passed an anti-racetrack gambling bill known as the Walker–Otis Law. Similar in its goal to New York State's 1908 Hart–Agnew Law, the California law resulted in the permanent closing of the Baldwin racetrack. In 1912 the racing facility burned to the ground.

In 1933, California legalized parimutuel wagering and several investor groups worked to open racetracks. In the San Francisco area, a group headed by Dr. Charles H "Doc" Strub was having trouble locating a site. In the Los Angeles area, a group headed by movie producer Hal Roach was in need of further funds. These two groups combined and the newly formed Los Angeles Turf Club opened the present day track on Christmas Day in 1934, making it the first formally-established racetrack in California. Architect Gordon Kaufmann designed its various buildings in a combination of Colonial Revival and a type of Art Deco known as Streamline Moderne, painted primarily in Santa Anita's signature colors of Persian Green and Chiffon Yellow.

In February 1935, the first Santa Anita Handicap was run. The race's $100,000 purse, largest of any race ever in the United States until that time, produced its nickname the Big 'Cap.

In its heyday, the track's races attracted such stars as Betty Grable, Lana Turner, Edgar Bergen, Jane Russell, Cary Grant, Clark Gable, and Esther Williams, among others. Bing Crosby, Joe E. Brown, Al Jolson, and Harry Warner were all stockholders.

In 1940, Seabiscuit won the Santa Anita Handicap in his last start.

In 1942, racing at Santa Anita was suspended due to the Second World War. Santa Anita was used as an assembly center for Japanese Americans excluded from the West Coast. For several months in 1942, over 18,000 people lived in horse stables and military-style barracks constructed on the site, including actor George Takei, then a young boy. After the track reopened in 1945, it went through the postwar years with prosperity. A downhill turf course, which added a distinctly European flair to racing at Santa Anita, was added in 1953.

Due to its proximity to Los Angeles, Santa Anita has traditionally been associated with the film and television industries. The racetrack sequences in the Marx Brothers 1937 classic A Day at the Races were filmed there, and The Story of Seabiscuit with Shirley Temple was filmed on location in 1949. It was also featured in A Star Is Born (1937). Several stars, including Bing Crosby, Spencer Tracy, Errol Flynn, Alex Trebek, and MGM mogul, Louis B. Mayer, have owned horses that raced at the park.