Millburn is a suburban township in Essex County, New Jersey, United States. As of the 2010 United States Census, the township's population was 20,149, reflecting an increase of 384 (+1.9%) from the 19,765 counted in the 2000 Census, which had in turn increased by 1,135 (+6.1%) from the 18,630 counted in the 1990 Census.

Millburn was created as a township by an act of the New Jersey Legislature on March 20, 1857, from portions of Springfield Township, when Union County was formed. Earlier known variously as Milltown, Millville, Rum Brook and Vauxhall, the name "Millburn" was adopted before the township was established. The township's name derives from the burn (Scottish for a stream) that powered mills in the area.

The township is home to the South Mountain Reservation, The Mall at Short Hills and the Paper Mill Playhouse, an established regional theater.

New Jersey Monthly magazine ranked Millburn as the 53rd best place to live in New Jersey in its 2008 rankings of the "Best Places To Live" in New Jersey.

Millburn had the highest annual property tax bills in New Jersey in 2009 at $19,097, compared to the statewide average of $7,300 that year, which was the highest in the United States. This is primarily a function of high property values, as Millburn had the lowest effective property tax rate in 2014 (1.9%) among the 22 municipalities in Essex County.

In June 2007, Millburn celebrated its 150th birthday in its downtown, in one of the biggest celebrations in Millburn history.

According to the United States Census Bureau, the township had a total area of 9.876 square miles (25.579 km²), including 9.322 square miles (24.145 km²) of land and 0.554 square mile (1.434 km²) of water (5.61%).

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