The Carnegie Deli was a Jewish delicatessen, formerly a chain, based in New York City. Its main branch, opened in 1937 near Carnegie Hall, was located at 854 7th Avenue (between 54th and 55th Streets) in Midtown Manhattan. It closed on December 31, 2016. There is one branch still in operation at Madison Square Garden in Manhattan, and the deli still operates a wholesale distribution service.

The Parker family's delicatessen was in its third generation of owners. Among the United States' most renowned delis, it was operated by a second-generation owner, Marian Harper Levine.

The restaurant offered pastrami, corned beef, and other sandwiches containing at least one pound (450 g) of meat, as well as traditional Jewish fare such as matzoh ball soup, latkes, chopped chicken livers, and lox. The restaurant also offered other, non-Jewish food such as ham, sausage, and bacon. Available for order were cheesecake portions of over one pound (450 g) per serving. The restaurant's motto was: "If you can finish your meal, we've done something wrong." In addition to the large servings, the restaurant was also known for its surly waiters, who allegedly tried to impart some of the stereotypical gruffness of New York to visitors.

Leo Steiner (c. 1939 – December 31, 1987) was a Jewish American restaurateur who was co-owner of the first Carnegie Deli, located at 55th Street and Seventh Avenue in Midtown Manhattan near Carnegie Hall. While his partner, Milton Parker, mostly worked behind the scenes, Steiner worked the crowd with his Jewish humor in the restaurant, which became a destination for both celebrities and tourists in the theater district. Steiner was born in Newark, New Jersey. He worked in his parents' grocery store in nearby Elizabeth, New Jersey, where he grew up. The one-time owner of Pastrami & Things, a delicatessen located at Third Avenue and 23rd Street, he joined Milton Parker and Fred Klein in 1976, purchasing the Carnegie Deli from the trio of Bernie Gross, Max Hudas and Thomas North. Klein, who had not been actively involved in running the business, dropped out shortly thereafter.

Under the management of Parker and Steiner, the deli became known nationwide, attracting celebrities such as Woody Allen, Jackie Mason and Henny Youngman, and opened branch locations in Atlantic City, New Jersey; Secaucus, New Jersey; and Tysons Corner, Virginia. Steiner became the public face of Jewish food, appearing in a television commercial for rye bread. He created a 60-pound (27 kg) Statue of Liberty carved from chopped liver, complete with a torch fashioned from a turkey wing, for the United States Bicentennial and was asked to prepare corned beef and pastrami for visiting heads of state attending the G7 economic summit meeting held in 1983 in Williamsburg, Virginia. Portions of Woody Allen's 1984 movie Broadway Danny Rose were filmed in the restaurant.

Milton Parker, who died in 2009, had written a book (with Allyn Freeman) called How to Feed Friends and Influence People: The Carnegie Deli, providing the history of the family's ownership.

On April 24, 2015, the main Midtown Manhattan branch of Carnegie Deli was closed temporarily due to the discovery of an illegal gas line in the restaurant. Con Edison was investigating the incident, later fining the eatery $40,050. On July 28, 2015, Carnegie Deli was subsequently closed for upgrades to its gas lines. The deli reopened on February 9, 2016.

On September 30, 2016, it was announced that the Midtown Manhattan branch of the deli would close by the end of the year. The owner, Marian Harper Levine, stated that she needed a more permanent break from operating the restaurant, saying, "At this stage of my life, the early morning to late night days have taken a toll, along with my sleepless nights and grueling hours that come with operating a restaurant business in Manhattan." Two branches in Las Vegas, Nevada, and Bethlehem, Pennsylvania, remained open, as well as the wholesale distribution service.