Lagoa (English: Lagoon) is an affluent residential neighborhood in Rio de Janeiro, Brazil located around the Rodrigo de Freitas Lagoon.

It borders the neighborhoods of Ipanema, Leblon, Copacabana, Gávea, Jardim Botânico, and Humaitá.

It is the third most expensive neighborhood to live in South America.

It is also one of the few places in Rio de Janeiro without a favela.

Around Rodrigo de Freitas Lagoon, there is a 7.5 km long cycleway and many parks.