Roseland is a borough in western Essex County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 5,819, reflecting an increase of 521 (+9.8%) from the 5,298 counted in the 2000 Census, which had in turn increased by 451 (+9.3%) from the 4,847 counted in the 1990 Census.
New Jersey Monthly magazine ranked Roseland as its 7th best place to live in its 2015 rankings of the "Best Places To Live" in New Jersey. The borough was ranked 14th best place to live in the magazine's 2008 rankings. In 2017 New Jersey Monthly Ranked Roseland as its 106th best place to live in its 2017 Rankings. In 2019 New Jersey Monthly magazine ranked Roseland as 14th best place to live in NJ in its 2019 rankings.
Roseland was part of the Horseneck Tract, which was an area that consisted of what are now the municipalities of Caldwell, West Caldwell, North Caldwell, Fairfield, Verona, Cedar Grove, Essex Fells, Roseland, and portions of Livingston and West Orange. In 1702, settlers purchased the 14,000 acres (57 km2) Horseneck Tract — so-called because of its irregular shape that suggested a horse's neck and head — from the Lenni Lenape Native Americans for goods equal to $325. This purchase encompassed much of western Essex County, from the First Mountain to the Passaic River.
Originally named Centerville, the name of the community was changed in 1874 to Roseland to avoid confusion with the several other Centervilles spread across the state, most specifically Centerville, Hunterdon County, New Jersey, which already had a post office under that name. Roseland was chosen over the alternative proposed name of "Roselyn".
One of the most notable places of interest in the borough was the Becker Farm Railroad, otherwise known as the Centerville & Southwestern Railroad. A miniature railroad operated from 1938 until 1972 on the Becker Farm, which once comprised nearly half of the total area within Roseland and which is now mostly a large business complex.