Dumbo (or DUMBO, short for Down Under the Manhattan Bridge Overpass) is a neighborhood in the New York City borough of Brooklyn. The area used to be known as Gairville. It encompasses two sections: one located between the Manhattan and Brooklyn Bridges, which connect Brooklyn to Manhattan across the East River, and another that continues east from the Manhattan Bridge to the Vinegar Hill area. The neighborhood is bounded by Brooklyn Bridge Park to the north, the Brooklyn Bridge to the west, Brooklyn Heights to the south and Vinegar Hill to the east. Dumbo is part of Brooklyn Community Board 2.

The area was originally a ferry landing, characterized by 19th- and early 20th-century industrial and warehouse buildings, Belgian block streets, and its location on the East River by the imposing anchorage of the Manhattan Bridge. The entirety of Dumbo was bought by developer David Walentas and his company Two Trees Management in the late 20th century, and remade into an upscale residential and commercial community—first becoming a haven for art galleries, and currently a center for technology startups.

The large community of tech startups earned Dumbo the nickname of "the center of the Brooklyn Tech Triangle". In that time, Dumbo had become Brooklyn's most expensive neighborhood, as well as New York City's fourth-richest community overall; this is owing in part to its large concentration of technology startups, its close proximity to Manhattan, and its large number of former industrial buildings that have been converted into spacious luxury residential lofts. The neighborhood is the corporate headquarters for e-commerce retailer Etsy and home furnishing stores company West Elm.