Miami Beach is a coastal resort city located in Miami-Dade County, Florida, within the United States. It serves as a principal municipality in the Miami metropolitan area of South Florida. The city occupies natural and human-made barrier islands situated between the Atlantic Ocean and Biscayne Bay, with the bay separating it from the mainland city of Miami.

The area was purchased by Henry and Charles Lum in 1870 before being developed into a coconut plantation in the 1880s. Real estate development accelerated in the early 20th century through efforts by the Collins family, the Lummus brothers, and Carl G. Fisher. The Town of Miami Beach was chartered in 1915 and incorporated as a city in 1917, with the Collins Bridge opening in 1913 facilitating access.

The Art Deco Historic District, listed on the National Register of Historic Places in 1979, contains the world's largest collection of Art Deco architecture. This district features hundreds of structures built between 1923 and 1943, including hotels and apartments representing Mediterranean, Streamline Moderne, and Art Deco styles. The district is bounded by the Atlantic Ocean, Lenox Court, 6th Street, and Dade Boulevard.

Miami Beach has been a preeminent beach resort since the early 20th century, attracting wealthy tourists and later Jewish families and Cuban refugees. It is known for its trend-setting arts center, historic nightclubs, and cultural events. The neighborhood of South Beach forms part of South Florida's commercial center alongside downtown Miami and PortMiami.

The population was 82,890 at the 2020 census. The city is accessible via Miami International Airport or Fort Lauderdale International Airport, with car access provided by Interstate 95 and the Venetian Causeway. Its warm climate and status as a popular spring break destination continue to draw visitors to its beach resorts and entertainment districts.