Gramercy Park () is the name of both a small, fenced-in private park and the surrounding neighborhood that is referred to also as Gramercy, in the New York City borough of Manhattan in New York, United States.The approximately 2-acre (0.8 ha) park, located in the Gramercy Park Historic District, is one of two private parks in New York City – the other is Sunnyside Gardens Park in Queens – as well as one of only three in the state; only people residing around the park who pay an annual fee have a key, and the public is not generally allowed in – although the sidewalks of the streets around the park are a popular jogging, strolling, and dog-walking route.

The neighborhood is mostly located within Manhattan Community District 6, with a small portion in Community District 5. It is generally perceived to be a quiet and safe area.The neighborhood, associated historic district, and park have generally received positive reviews. Calling it "a Victorian gentleman who has refused to die", Charlotte Devree in The New York Times said that "There is nothing else quite like Gramercy Park in the country." When the New York City Landmarks Preservation Commission created the Gramercy Park Historic District in 1966, they quoted from John B. Pine's 1921 book, The Story of Gramercy Park:

The laying out of Gramercy Park represents one of the earliest attempts in this country at 'City Planning'. ... As a park given to the prospective owners of the land surrounding it and held in trust for those who made their homes around it, Gramercy Park is unique in this City, and perhaps in this country, and represents the only neighborhood, with possibly one exception, which has remained comparatively unchanged for eighty years – the Park is one of the City's Landmarks.