The United States Senate election of 1942 in New Jersey was held on November 3, 1942. Incumbent Democratic Senator William Smathers ran for re-election to a second term, but was defeated by Republican businessman Albert Hawkes.
As of , this is the last time an incumbent U.S. Senator from New Jersey lost re-election, although in 2002 incumbent Senator Robert Torricelli dropped out in late September while trailing in the polls.
Senator Smathers was unopposed for re-nomination.
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