The 1918 United States Senate elections in New Jersey were held on November 7, 1918.
Incumbent Democratic Senator William Hughes died in office in January. Republican governor of New Jersey Walter Evans Edge was elected to the six-year term over Democrat George LaMonte. In a special election held the same day, interim Senator David Baird Sr. (whom Edge had appointed) was elected to serve the remainder of Senator Hughes' term over Charles O'Connor Hennessy.
In the primary election on September 24, Edge easily won the Republican nomination over George L. Record and Edward W. Gray. LaMonte won a four-cornered primary over Charles O'Connor Hennessy, Alexander Simpson, and Frank M. McDermit.
Both Baird and Hennessy were unopposed in the special election primary.
In the soldiers' vote, included in the totals above, Hennessey won 604 to 598 votes for Simpson, 578 votes for McDermit, and 545 votes for LaMonte.
Charles O'Connor Hennessy was unopposed for the nomination to the special election. He received 51,183 votes from civilians and 1,587 votes from soldiers. In Hunterdon County, LaMonte received two votes and McDermit received one.
In the soldiers' vote, included in the totals above, Edge won 2,981 to 188 votes for Record and 129 votes for Gray.
Interim Senator Baird was unopposed for the nomination to the special election. He received 96,067 votes from civilians and 1,848 votes from soldiers.
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