Carnegie Hill is a neighborhood within the Upper East Side, in the borough of Manhattan in New York City. Its boundaries are 86th Street on the south, Fifth Avenue ( Central Park) on the west, with a northern boundary at 98th Street that continues just past Park Avenue and turns south to 96th Street and proceeds east up to, but not including, Third Avenue.   The neighborhood is part of Manhattan Community District 8.
In the 2000s, the perceived northern boundary on Park Avenue has edged over 96th Street into what was traditionally Spanish Harlem,  leading to that area sometimes being called Upper Carnegie Hill, especially by real-estate brokers.  According to the official Carnegie Hill Neighbors website, the Carnegie Hill neighborhood extends from 86th to 98th Streets, from Fifth Avenue up to, but not including, Third Avenue. 
The neighborhood is named after the mansion that Andrew Carnegie built at Fifth Avenue and 91st Street in 1901.  Today the mansion houses the Cooper Hewitt, Smithsonian Design Museum, a branch of the Smithsonian Institution. Facing it on 91st Street is the Otto H. Kahn House, 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, of which some are now used by the Cooper Hewitt, Smithsonian Design Museum, The Jewish Museum, the National Academy of Design, the Dalton School and other organizations.  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 a new extension opened in 1993 that mimics 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 on Park Avenue 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 farther 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,  organizations which, seeking to preserve the village-like environment, spurred the creation of the historic district and actively monitor 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.  
Hunter College High School, a highly selective nationally ranked high school, is located at the corner of 94th Street and Park Avenue.
The New York City Department of Education operates public schools.
- Alpern, Andrew. The New York Apartment Houses of Rosario Candela and James Carpenter. (New York: Acanthus Press) 2002.
- Mendelsohn, Joyce. "Carnegie Hill" in Jackson, Kenneth T., ed. (2010). The Encyclopedia of New York City (2nd ed.). New Haven: Yale University Press. ISBN 978-0-300-11465-2., p.205. "Neighborhood on the Upper East Side of Manhattan, bounded to the north by 98th Street, to the east to, but not including, Third Avenue, to the south by 86th Street, and to the west by 5th Avenue."
- Satow, Julie (2004-12-16). "Carnegie Hill Spills Over its East 96th Street Border". The New York Sun. Retrieved 2008-07-14.
- Kusisto, Laura (October 21, 2011). "Reaching High on Upper 5th Avenue". The Wall Street Journal. Archived from the original on October 23, 2011. Retrieved February 22, 2013.
- About Us, Carnegie Hill Neighbors. Accessed October 5, 2018. "The Carnegie Hill catchment area extends from 86th Street to 98th Street, from the east side of Fifth Avenue to just west of Third Avenue."
- Maria Croce (2000-02-12). "The Battle of Carnegie Hill". Daily Record. Retrieved 2008-07-14.
- Until recently housing the Smithers Alcoholism Center.
- Claire Wilson (2006-10-08). "Full-Nest Zone, Empty-Nester Magnet". The New York Times. Retrieved 2008-07-14.
- Cathedral Stoneworks
- Paul Goldberger (2009-05-25). "Spiralling Upward". The New Yorker. Retrieved 2011-11-03.
- http://www.guggenheim.org/new-york/about-us/50th-anniversary Archived February 22, 2010, at the Wayback Machine guggenheim.org
- http://www.nycgovparks.org/sub_your_park/historical_signs/hs_historical_sign.php?id=11248 nycgovparks.org
- Christina Tree (2001-06-10). "Carnegie Hill: A Paean to the Past". The Boston Globe. Retrieved 2008-07-14.
- "Carnegie Hill Historic District" (PDF). Landmarks Preservation Commission. Archived from the original (PDF) on 2012-12-26. Retrieved 2008-07-14.
- Jake Mooney (2008-06-22). "Trying to Save a Link to a Legend and an Era". The New York Times. Retrieved 2008-07-14.
- 93rd Street Beautification Association
- Carnegie Hill Neighbors Archived April 30, 2010, at the Wayback Machine
- Maggie Garb (2000-03-19). "If You're Thinking of Living In/Carnegie Hill; Small-Town Feeling, Big-City Prices". The New York Times. Retrieved 2008-07-14.
- Jennifer Bleyer (2005-07-31). "Will a Rooftop Sunroom Spoil a Scenic View?". The New York Times. Retrieved 2008-07-14.
- Clarke, Catherine. " Italian private school drops $55M on new NYC cultural and education center " ( Archive). New York Daily News. Friday September 11, 2015. Retrieved on February 25, 2016.