Saddle River is a borough in Bergen County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 3,152, reflecting an decline of 49 (-1.5%) from the 3,201 counted in the 2000 Census, which had in turn increased by 251 (+8.5%) from the 2,950 counted in the 1990 Census. Nationwide, Saddle River ranked 28th as of the 2000 Census among the 100 highest-income places in the United States (with at least 1,000 households).
Saddle River was incorporated as a borough by an Act of the New Jersey Legislature on November 22, 1894, from portions of Orvil Township, based on the results of a referendum held three days earlier, at the height of the "Boroughitis" phenomenon sweeping through Bergen County at the time. It is a dry town, where alcohol cannot be sold.
The borough is named after the Saddle River, which flows through the borough and is a tributary of the Passaic River.