Eighth Avenue is a major north–south avenue on the west side of Manhattan in New York City, carrying northbound traffic below 59th Street. It is one of the original avenues of the Commissioners' Plan of 1811 to run the length of Manhattan, though today the name changes twice: At 59th Street/Columbus Circle, it becomes Central Park West, where it forms the western boundary of Central Park, and north of 110th Street/Frederick Douglass Circle, it is known as Frederick Douglass Boulevard before merging onto Harlem River Drive north of 155th Street.

The Commissioners' Plan of 1811 was the original design for the streets of Manhattan above Houston Street and below 155th Street, which put in place the rectangular grid plan of streets and lots that has defined Manhattan on its march uptown until the current day. It has been called "the single most important document in New York City's development," and the plan has been described as encompassing the "republican predilection for control and balance ... [and] distrust of nature". It was described by the Commission that created it as combining "beauty, order and convenience."