Carnegie Hill is a neighborhood within the Upper East Side, in the borough of Manhattan in New York City. Its boundaries extend from 86th Street on the south to 96th Street to the north, between Fifth Avenue (Central Park) on the west and Third Avenue on the east, and up to 98th Street from Fifth to Park avenues. The neighborhood is part of Manhattan Community Board 8. Carnegie Hill is widely considered one of the most prestigious residential areas of the Upper East Side.

The neighborhood is named for the mansion that Andrew Carnegie built at Fifth Avenue and 91st Street in 1901. Today the mansion houses the Cooper-Hewitt, National Design Museum, a branch of the Smithsonian Institution. Facing it on 91st Street is the Otto Kahn House (illustration below), a Florentine palazzo, now housing the Convent of the Sacred Heart. A number of other townhouses in the area have been converted to schools, including the recent purchase of the William Goadby and Florence Baker Loew House on 93rd Street by the Spence School. The Lycée Français, housed in the former Virginia Graham Fair Vanderbilt House, held an additional townhouse space on 93rd between Fifth and Madison Avenue until 2005, when the property was sold to a private owner.

The architecture of the neighborhood includes apartment buildings along Park Avenue and Fifth Avenue, brownstones (with stoops) and townhouses on the side streets, condos, co-ops and a handful of mansions, some of which are now used by organizations including the Cooper-Hewitt Museum, The Jewish Museum, the National Academy of Design and the Dalton School. From the 1950s to 1991, the National Audubon Society was housed in the Willard Straight House, a red brick Colonial Revival townhouse at 1130 Fifth Avenue. When it moved to NoHo, the International Center of Photography moved in but later consolidated its operations in Midtown near Bryant Park. In 2001, it again became a private residence. In 1989, the Jewish Museum demolished the 1963 modernist addition and courtyard, replacing it with an new extension opened in 1993 that mimicks the French Gothic details of the Warburg Mansion, the museum's home since 1947. The limestone was crafted in Morningside Heights at the Cathedral Stoneworks. Frank Lloyd Wright's originally maligned and now celebrated Guggenheim Museum opened on Fifth Avenue in 1959. The New York Road Runners occupies a townhouse around the corner at 9 East 89th Street, a block informally known as Fred Lebow Place.

Similar to the official lines of the historic district, the borders of the neighborhood form an irregular rectangle and the northern boundary, which traditionally was 96th Street, has edged into what was traditionally Spanish Harlem.

The northern section neighborhood was once seen as a less fashionable end of the East Side, but is now prized for its esthetic sensibility, museums and restaurants. Besides, Andrew Carnegie, Marjorie Merriweather Post, Margaret Rockefeller Strong and John Hay Whitney all made their homes north of 90th Street.

The Carnegie Hill Historic District, designated as such by the Landmarks Preservation Commission on July 23, 1974 and then expanded on December 21, 1993, runs from 86th Street in the south to just north of 98th Street in the north. Its western boundary is Central Park, and its eastern boundary varies from Madison Avenue in some parts to Lexington Avenue further east in others. There are efforts to expand this district in order to protect undesignated landmarks , including 179 East 93rd Street, where the Marx Brothers were raised. Proponents include the 93rd Street Beautification Association and Carnegie Hill Neighbors, an organization which, seeking to preserve the village-like environment, spurred the creation of the historic district and actively monitors its well being. In its more than thirty years of operation, its well-publicized battles have included advocating against an adult education center near the 92nd Street Y, plans for more high rise apartments and additions to existing brownstones.

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