Arcadia is a city in Los Angeles County, California, United States located about 13 miles (21 km) northeast of downtown Los Angeles in the San Gabriel Valley and at the base of the San Gabriel Mountains. It is the site of the Santa Anita Park racetrack and home to the Los Angeles County Arboretum and Botanic Garden. The city is named after Arcadia, Greece.

In 2016, Arcadia was ranked the 5th most expensive housing market in the United States by Business Insider, with an average list of $1,748,680 for a four-bedroom home. In 2012, Arcadia was ranked 7th in the nation on CNN Money magazine's list of towns with highest median home costs.  Arcadia's Upper Rancho neighborhood was ranked the 23rd richest neighborhood in Southern California by Business Insider in 2014, with a med household income of $310,779.

Located northeast of downtown Los Angeles, Arcadia is bordered by six other communities: Pasadena, Sierra Madre, El Monte, San Marino, Monrovia, and Temple City.

Education - Arcadia Unified School District has one highly ranked and prestigious high school, Arcadia High School. It is among the few public high schools in California to receive a distinguished Great Schools Rating of 10 out of 10. In 2010, BusinessWeek ranked Arcadia as the best place to raise children in the state of California for the second year in a row, citing the city's excellent school system as one of the factors in addition to the low crime rate.