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New York State Route 9A (NY 9A) is a state highway in the vicinity of New York City, New York, United States. Its southern terminus is at the northern end of the Brooklyn–Battery Tunnel in New York City, where it intersects with both Interstate 478 and FDR Drive. The northern terminus of NY 9A is at U.S. Route 9 in Peekskill. It is predominantly an alternate route of US 9 between New York City and Peekskill; however, in New York City, it is a major route of its own as it runs along the West Side Highway and Henry Hudson Parkway. In Westchester County, NY 9A follows the Briarcliff–Peekskill Parkway.

The origins of NY 9A date back to the 1920s when an alternate route of then-NY 6 from Yonkers to Tarrytown was designated as New York State Route 6A. NY 6 was redesignated as US 9 in 1927; however, NY 6A was not renumbered to NY 9A until the 1930 renumbering of state highways in New York. NY 9A was extended south into New York City in 1934 and north to Ossining in the late 1930s. In 1933, the Briarcliff–Peekskill Parkway opened as New York State Route 404. All of NY 404 was incorporated into an extended NY 9A in the late 1940s. NY 9A was extended northward to Peekskill in 1967 following the completion of the Croton Expressway and southward to the Brooklyn–Battery Tunnel between 1985 and 1995.