Frelinghuysen is a surname of Dutch origin. It may refer to:
People People with the surname Frederick Frelinghuysen (general) (1753–1804), U.S. Army general and New Jersey politician Frederick Frelinghuysen (businessman) (1848–1924), Insurance company president Frederick Theodore Frelinghuysen (1817–1885), U.S. senator and Secretary of State George Griswold Frelinghuysen (1851-1936), of Ballantine beer John Frelinghuysen (minister) (1727–1754), American clergyman and son of Theodorus Jacobus Frelinghuysen John Frederick Frelinghuysen (1776–1833), U.S. Army general and lawyer Joseph Sherman Frelinghuysen, Sr. (1869–1948), U.S. senator from New Jersey Joseph Sherman Frelinghuysen, Jr. (1912-2005), U.S. soldier, prisoner of war, author, and businessman Peter Hood Ballantine Frelinghuysen II (1916-2011), U.S. congressman from New Jersey Rodney Frelinghuysen (born 1946), U.S. congressman from New Jersey Suzy Frelinghuysen (née Estelle, 1911–1988), American artist Theodore Frelinghuysen (1787–1862) New Jersey Attorney General, U.S. senator, and mayor of Newark, New Jersey Theodorus Jacobus Frelinghuysen (1691–1748), Dutch immigrant to U.S. and theologian Theodorus Jacobus Frelinghuysen II (1724–1761), theologian
People with the given name Carl Frelinghuysen Gould (1873-1939), American architect Theodore Frelinghuysen Jewell (1844-1932), U.S. Navy admiral Theodore Frelinghuysen Seward (1835-1902), American musician, writer and educator Theodore Frelinghuysen Singiser (1845–1907), American politician
Places Frelinghuysen Township, New Jersey Frelinghuysen Avenue in Newark, New Jersey Frelinghuysen Road in Piscataway, New Jersey
Things Frelinghuysen Arboretum, Morristown, New Jersey General John Frelinghuysen House, building on the National Register of Historic Places in Raritan, New Jersey Frelinghuysen University, a defunct historically Black university in Washington, D.C.
See also Johann Anastasius Freylinghausen