Cornelius Andrew Cadmus (born October 7, 1844) was a Democratic member of the United States House of Representatives from New Jersey. He represented New Jersey’s 5th Congressional District and is recorded as a historical member of Congress. His service in the U.S. House is the primary basis for his public legacy.

Cadmus served as a Representative from December 7, 1891, to March 3, 1895, completing two terms in Congress. During this period, he held office as a member of the Democratic Party, representing the interests of his New Jersey constituents at the federal level. After leaving Congress, he is regarded as a former officeholder, with no further official roles or committee assignments noted in the available record.