Madeira Beach is a coastal city located in Pinellas County, Florida, within the United States. It sits on a barrier island positioned between the Gulf of Mexico to the southwest and Boca Ciega Bay to the northeast. The municipality is bordered on the east by the city of St. Petersburg and connects to the mainland via the Tom Stuart Causeway in the unincorporated community of Bay Pines. This geographic placement defines its identity as a distinct waterfront community within the broader Tampa Bay region.

The modern physical shape of the city was established by the Gale of '48, a hurricane that carved out the strait now known as John's Pass. Named after early homesteader John Levique, this waterway separated the landmasses and facilitated future development. While earlier attempts to settle the area failed, a causeway was constructed in 1926, allowing for the first residential buildings. The town officially incorporated in May 1947 and later annexed South Madeira in 1951, significantly expanding its boundaries through dredging operations in the subsequent decades.

The city features the entertainment district of John's Pass along the Intracoastal Waterway and is home to Church By The Sea, a non-denominational structure built between 1944 and 1946. Its tower resembles a chicken, leading locals to colloquially call it the Chicken Church. The area also includes the Madeira Beach Memorial, constructed from a beam of the World Trade Center, located in Causeway Park. Significant construction in the 1970s and 1980s added numerous beach condos and hotels, shaping its current architectural landscape.

Often referred to by locals as Mad Beach, the city serves as a popular vacation destination known for its relaxed atmosphere. Visitors are drawn to its gulf beaches and local amenities such as Mad Beach Brewing Co., which offers dining along 699. The community hosts events centered around its maritime heritage and natural beauty, including the John's Pass Marina, a federally owned canal that remains a focal point for water activities and local tourism throughout the year.

As of the 2020 census, the population was 3,895, with a median age of 58.1 years. The city operates under a humid subtropical climate classified as Cfa, characterized by mild temperate conditions and fully humid summers. Transportation access is primarily provided by the Tom Stuart Causeway bridge. The local economy supports various residential and commercial facilities, including Madeira Beach Fundamental School and numerous housing units that cater to both permanent residents and seasonal visitors.