Randolph is a township in Morris County, New Jersey, United States. As of the 2010 United States Census, the township's population was 25,734, reflecting an increase of 887 (+3.6%) from the 24,847 counted in the 2000 Census, which had in turn increased by 4,873 (+24.4%) from the 19,974 counted in the 1990 Census.

The earliest known inhabitants of what is now Randolph were the Lenni Lenape Native Americans. The earliest European settlers of what is now Randolph were Quakers and one of the pioneering landowners was Hartshorne Fitz-Randolph, who purchased 1,000 acres (4.0 km²) of what would become the township in the Mine Hill area in 1753, later becoming the namesake of the township. New Jersey's first iron mine was established in Randolph in 1713, and for hundreds of years the mines fostered the development of the township, providing the raw materials for weapons used by the Continental Army during the American Revolutionary War. During the war, the area was a supply point for George Washington's army during their winter encampment in nearby Jockey Hollow.

Randolph was incorporated as a township by an act of the New Jersey Legislature on January 1, 1806, from portions of Mendham Township. Portions of the township were taken on April 1, 1869, to create Dover Town within the township, which became an independent municipality as of March 5, 1896. Other portions of the township were taken to create Port Oram (June 26, 1895, now Wharton), Mine Hill Township (March 2, 1923) and Victory Gardens (June 20, 1951).

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