The 1985 New Jersey General Assembly election was held on November 5, 1985.
The elections coincided with Governor Tom Kean's landslide re-election. The result was a historic victory for Kean's Republican Party, which gained 14 seats to retake the majority in the Assembly. As of 2025, this remains the only election since 1973 in which Republicans won any seats in the Senate or Assembly from Hudson County, where they carried four of six seats.
^Genova won a March 1985 special election to complete the unexpired term of Assemblyman Edward K. Gill, who died of heart disease.
^Martin won a January 1985 special election to complete the unexpired term of Assemblyman Dean Gallo, who resigned to join the U.S. House of Representatives.
^Randall won a March 1985 special election to complete the unexpired term of Assemblyman John W. Markert.