Charles Sandman Republican John A. Lynch Sr. Democratic The 1965 New Jersey Senate elections were held on November 2.

The ruling forced New Jersey to grant multiple seats to its largest counties (and eventually, switch to single-member districts that did not follow county lines).

The election also coincided with a landslide re-election victory for Democratic Governor Richard J. Hughes.

After the U.S. Supreme Court decision Reynolds v. Sims required legislative districts to be approximately equal in population (a principle known as "one man, one vote"), New Jersey entered a decade-long period of reapportionment.

[1] The overall effect of the reapportioning was to reduce representation for rural counties and increase representation for more populous urban counties, bringing the per person population closer to parity.