Senator Frelinghuysen may refer to:
Frederick Theodore Frelinghuysen (1817–1885), U.S. Senator from New Jersey from 1871 to 1877 Frederick Frelinghuysen (general) (1753–1804), U.S. Senator from New Jersey from 1793 to 1796 Joseph S. Frelinghuysen Sr. (1869–1948), U.S. Senator from New Jersey from 1917 to 1923 Theodore Frelinghuysen (1787–1862), U.S. Senator from New Jersey from 1829 to 1835
See also Frelinghuysen (disambiguation)