:L.E.S. redirects here. For the music producer, see L.E.S. (producer).
The Lower East Side is a neighborhood of the New York City borough of Manhattan. It has traditionally been an immigrant, working class neighborhood, but it has undergone gentrification in recent years and is increasingly populated by young professionals, artists, students and hipsters. While the exact boundaries of the neighborhood are open to debate, it today refers to the area of Manhattan south of East Houston Street along the East River, roughly bounded on the west by Bowery and the south by Canal Street.

Chinatown borders the Lower East Side on the south and the west up to roughly Broome Street, NoLIta on the east from Broome Street to East Houston Street, and the East Village on the north.

Originally, "Lower East Side" referred to the area alongside the East River from about the Manhattan Bridge and Canal Street up to 14th Street, and roughly bounded on the west by Broadway. Today, the term Lower East Side refers to the area bounded to the north by East Houston Street and to the west by The Bowery. The area north of Houston Street is now known as the East Village, although parts of East Village are still known as Loisaida, a Latino pronunciation of "Lower East Side," and Alphabet City around Tompkins Square Park, which was once known as Little Germany.

This point of land on the East River was also called Crown Point under British rule. It was an important landmark for navigators for 300 years. On older maps and documents it is usually spelled Corlaers, but since the early 19th Century the spelling has been anglicized to Corlears. It was named after Jacobus van Corlaer, who settled there prior to 1640. The original location of Corlaers Hook is now obscured by shoreline landfill. It was near the east end of the present pedestrian bridge over the FDR Drive near Cherry Street.

East Village was once Lower East Side's northwest corner alongside Greenwich Village; it received that name from real estate developers in the 1980s trying to dissociate the area from the Lower East Side's reputation. The name stuck and the term "Lower East Side" now refers specifically to the portion of the neighborhood lying south of Houston Street and East Village has become its own separate neighborhood.

In the early 2000s, the gentrification of the East Village spread to the Lower East Side, making it one of the trendiest neighborhoods in Manhattan. Clinton Street and Orchard Street are lined with upscale restaurants and boutiques, although Orchard Street is still dominated by discount clothing stores.

In late 2004, a boutique hotel, The Hotel on Rivington, or THOR, opened on Rivington Street. The glass-walled, 22-storied hotel towers over the neighborhood and provides a sharp contrast to the surrounding lowrise brick tenements.

In recent years, the gentrification that was previously confined to north of Delancey Street has continued south. Several restaurants, bars and galleries have opened below Delancey Street since 2005, especially around the intersection of Broome and Orchard Streets. The neighborhood's second boutique hotel, Blue Moon Hotel opened on Orchard Street just south of Delancey Street in early 2006. However, unlike THOR, the Blue Moon used an existing tenement building and its exterior is almost identical to neighboring buildings.