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is a township in Monmouth County, New Jersey, United States. As of the United States 2000 Census, the township population was 15,781.
Holmdel Township was formed by an Act of the New Jersey Legislature on February 23, 1857, from portions of Raritan Township (now Hazlet).
In 1964, Arno Penzias and Robert Wilson of Bell Labs discovered the cosmic microwave background radiation while working on the Horn Antenna in this town. The earliest work on radio astronomy was conducted by Bell Labs engineer Karl Guthe Jansky in 1931, also in this town.
The PNC Bank Arts Center (formerly the Garden State Arts Center), a popular outdoor amphitheatre concert venue that opened in 1968, is located in Holmdel. Adjacent to it is the New Jersey Vietnam Veterans Memorial, which opened on May 7, 1995.
VoIP provider Vonage Holdings, Inc., moved its world headquarters from Edison, New Jersey, to Holmdel in November 2005, occupying the building that formerly housed Prudential Property Casualty & Insurance.