Harrington Township was a township that existed in Bergen County, New Jersey, United States, from 1775 until 1916. It was named after the Haring family, early settlers to the region. The spelling was originally "Harington Township", based on the family name "Haring", but was changed to "Harrington" in the latter part of the 19th century. On April 13, 1840, the territories west of the Hackensack River were taken from Harrington Township to form Washington Township.