Armação dos Búzios is a municipality situated in the state of Rio de Janeiro, Brazil, within the Região dos Lagos region. It occupies a peninsula extending eight kilometers into the Atlantic Ocean, featuring twenty-three distinct beaches along its coastline. The town lies approximately 173 kilometers east of the city of Rio de Janeiro and 24 kilometers southwest of Cabo Frio. As a coastal municipality, it serves as a significant administrative and tourist hub in this part of southeastern Brazil.

The area was originally occupied by Tupinambá Indians during the sixteenth century before European invasion in the seventeenth century led to conflicts with French pirates and smugglers. The name Armação dos Búzios derives from the historical process of separating whale meat from bones, a practice that declined after the abolition of the slave trade around 1850. The town remained largely unknown until 1964, when French actress Brigitte Bardot visited, sparking its transformation into an international tourist destination popular with high society.

The municipality is defined by its diverse coastal geography, with west coast beaches offering calm waters and east coast shores providing wilder conditions for surfers. Notable sites include the historic Sant'Ana Chapel, built with rocks and whale oil, and Rua das Pedras, the main street known for its active nightlife and shopping. The peninsula features popular beaches such as Geribá, Ferradura, João Fernandes, and Azeda, each offering distinct landscapes and activities for visitors exploring the coastal environment.

Búzios attracts visitors through its sophisticated dining scene, including pay-by-the-kilo restaurants like Boom, and vibrant nightlife that typically begins late in the evening. The town hosts an annual Jazz Festival in July and offers various water sports, including scuba diving and boat trips to nearby islands. Its appeal lies in the combination of natural beauty, cultural events, and a relaxed atmosphere that draws tourists seeking both relaxation and entertainment along the Brazilian coast.

The population was recorded as 42,527 in 2025, having grown from 34,477 in 2020. The local economy relies heavily on tourism, supported by access via Umberto Modiano Airport for general aviation and bus services from Rio de Janeiro. The climate is tropical, with temperatures ranging from 20°C to 30°C annually, and the best times to visit are during dry periods in May, April, or June to avoid the heavy rainfall of March.