Hackensack Township was a township that was formed in 1693 within Bergen County, New Jersey, United States. The township was created by the New Jersey Legislature as one of the first group of townships in New Jersey. Bergen County, which had been created in 1682, was thus split into two parts: Hackensack Township to the north, and Bergen Township to the south.
Despite its name, Hackensack Township did not encompass the present-day city of Hackensack, which was within New Barbadoes Township on the west side of the Hackensack River.
As originally constituted on October 31, 1693, the township included portions of present-day Bergen County between the Hudson River on the east and the Hackensack River to the west, northward to the boundary with New York and south to the border with current Hudson County.
In 1775, Harrington Township was formed by royal charter from the northern portions of both New Barbadoes Township and Hackensack Township.
On March 22, 1871, Hackensack Township was subdivided into three new townships, each stretching from the Hudson River on the east to the Hackensack River in the west. The northern portion became Palisades Township, the center strip became Englewood Township, and the southern portion became Ridgefield Township. With the creation of these three new townships, Hackensack Township was dissolved that same day, March 22, 1871.