City Line is a sub-section of the East New York neighborhood in Brooklyn, New York City, bordering the neighborhoods of Cypress Hills to the north and Ozone Park, Queens to the east, and the Shore Parkway to the south. The neighborhood is named "City Line" for its location in the former City of Brooklyn near the border with Queens County before Brooklyn and parts of Queens County were consolidated into New York City in 1898.

City Line is one of the most ethnically diverse neighborhoods in Brooklyn. Many Italians, Germans and Irish originally lived in the area, which today is home to immigrants from Bangladesh, the Dominican Republic, Guyana, and Puerto Rico.

City Line is served by the New York City Subway with the A train and the C train of the IND lines. The main commercial district is located along Liberty Avenue. The neighborhood is served by Brooklyn Community Board 5.

The Cypress Hills Houses contains 15 seven-story buildings with 1,442 apartments on a site between Linden Boulevard, Sutter Avenue, Euclid Avenue, and Fountain Avenue that is 29 acres (12 ha) in size. The housing complex was completed in 1955 and is run by the New York City Housing Authority.

The East New York City Line housing development is also run by the New York City Housing Authority and contains 33 three-story apartments with 63 apartments. The apartments are located just west of the Cypress Hills Houses and were completed in 1976.

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