Morningside Heights is a neighborhood on the West Side of Upper Manhattan in New York City. It is bounded by Morningside Drive to the east, 125th Street to the north, 110th Street to the south, and Riverside Drive to the west. Morningside Heights borders Central Harlem and Morningside Park to the east, Manhattanville to the north, the Manhattan Valley section of the Upper West Side to the south, and Riverside Park to the west. Broadway is the neighborhood's main thoroughfare, running north–south.

Morningside Heights, located on a high plateau between Morningside and Riverside Parks, was hard to access until the late 19th century and was sparsely developed except for the Bloomingdale and Leake and Watts asylums. Morningside Heights and the Upper West Side were considered part of the Bloomingdale District until Morningside Park was finished in the late 19th century. Large-scale development started in the 1890s with academic and cultural institutions. By the 1900s, public transportation construction and the neighborhood's first subway line led to Morningside Heights being developed into a residential neighborhood. Morningside Heights was mostly developed by the 1930s. During the mid-20th century, as the institutions within Morningside Heights expanded, cultural tensions grew between residents who were affiliated with institutions and those who were not. After a period of decline, the neighborhood started to gentrify in the 1980s and 1990s.

A large portion of Morningside Heights is part of the campus of Columbia University, a private Ivy League university. Morningside Heights contains numerous other educational institutions such as Teachers College, Barnard College, the Manhattan School of Music, Bank Street College of Education, Union Theological Seminary, and the Jewish Theological Seminary of America. Additionally, Morningside Heights includes several religious institutions, including the Cathedral of St. John the Divine, Riverside Church, the Church of Notre Dame, Corpus Christi Church, and Interchurch Center. The neighborhood also contains other architectural landmarks, such as St. Luke's Hospital (now Mount Sinai Morningside) and Grant's Tomb.

Morningside Heights is part of Manhattan Community District 9. It is patrolled by the 26th Precinct of the New York City Police Department with fire services being provided by the New York City Fire Department's Engine Company 47 and Engine Company 37/Ladder Company 40. Politically it is represented by the New York City Council's 7th District.

Initially, Manhattan was settled by the Lenape Native Americans, who referred to the area nearby as "Muscota" or "Muscoota", meaning "place of rushes". The nearest Native American settlements were Rechewanis and Konaande Kongh in present-day Central Park, to the southeast of modern Morningside Heights. Additionally, a Native American path in the area was adapted into part of modern-day Riverside Drive. However, the region remained relatively hard to access because of the steep topography. Prior to the beginning of the 18th century, most travel within modern New York City was made via water, since there were few roads in the region.

Dutch settlers occupied Manhattan in the early 17th century and called the nearby area "Vredendal", meaning "peaceful dale". The western boundary of New Harlem was drawn through the present-day Morningside Park in 1666, running from 74th Street at the East River to 124th Street at the North River (now Hudson River) on the neighborhood's western edge. The area to the west of the boundary, present-day Morningside Heights, was originally the common lands of British-occupied New York. In 1686, New York colonial governor Thomas Dongan granted the city of New York the patent to a triangular area between West 107th to 124th Streets, extending west to the Hudson River. The city sold the land to Jacob De Key in 1701. An easy connection to the rest of the modern-day city was made two years later, when Bloomingdale Road (modern-day Broadway) was extended north from Lower Manhattan to 117th Street. Harman Vandewater acquired part of the De Key farm by 1735, and it was called Vandewater Heights by 1738.

On September 16, 1776, the Battle of Harlem Heights was fought in the area, with the most intense fighting occurring in a sloping wheat field that is now the location of Barnard College. A plaque by the Columbia University gate on 117th Street and Broadway commemorates this battle. Vandewater Heights was sold by 1785 to James W. De Peyster. His brother, Nicholas De Peyster, bought the land directly to the west, along the shoreline.

Though a grid for Manhattan Island would be laid out in the Commissioners' Plan of 1811, the present-day Morningside Heights would remain sparsely developed for the next half-century, with the exception of the Bloomingdale Insane Asylum and the Leake and Watts Orphan Asylum. The Society for New York Hospital had started buying lots between Broadway and Amsterdam Avenues north of 113th Street in 1816, and opened the Bloomingdale Asylum in 1821. Leake and Watts Services purchased the Society's land east of Amsterdam Avenue between 110th and 113th Streets in 1834, and Ithiel Town's design for the Leake and Watts Asylum was completed in 1843. In addition, the Croton Aqueduct ran above ground through the modern neighborhood, opening in 1842.