Alpine is a borough in Bergen County, New Jersey, United States. As of the United States 2000 Census, the borough population was 2,183. According to Forbes, Alpine was ranked the first on its list of "Most Expensive ZIP Codes 2007", with a 2006 median home sale price of three million.

For the period between July 2006 and June 2007, Alpine ranked #1 in a tie with Fisher Island, Florida on the ABC News list of most expensive zip codes, with a median home sale price of $3.4 million.

Alpine was formed by an Act of the New Jersey Legislature on April 8, 1903 from portions of Harrington Township. The borough gained a portion of Cresskill in 1904.