Hialeah is a city in Miami-Dade County, Florida, United States. With the population of 233,339 at the 2019 United States Census, Hialeah is the sixth-largest city in Florida. It is a principal city of the Miami metropolitan area, which was home to an estimated 6,198,782 people at the 2018 census. It is located west-northwest of Miami, and is the only place in the county, other than Homestead, Florida, to have its own street grid numbered separately from the rest of the county (which is otherwise based on Miami Avenue at Flagler Street in downtown Miami, the county seat).

The city is notable for its high Hispanic proportion, which at 94.0%, is the second-highest proportion of Hispanic Americans out of any city in the United States outside of Puerto Rico. Hialeah also has the highest percentage of Cuban and Cuban American residents of any city in the United States, at 73.37% of the population, making them a typical and prominent feature of the city's culture.

Hialeah also has one of the largest Spanish-speaking communities in the country. In 2016, 96.3% of residents reported speaking Spanish at home, and the language is an important part of daily life in the city.

Hialeah is served by the Miami Metrorail at Okeechobee, Hialeah, and Tri-Rail/Metrorail Transfer stations. The Okeechobee and Hialeah stations serve primarily as park-and-ride commuter stations to commuters and residents going into Downtown Miami, and Tri-Rail station to Miami International Airport and north to West Palm Beach.