2021 New Jersey Senate election

The 2021 New Jersey State Senate election was held on November 2, 2021. New Jersey voters elected state senators in all of the state's legislative districts for a two-year term to the New Jersey Senate. This was the first election since 1991 where Republicans net gained state Senate seats. Democrats would later be restored to 25 seats following the party switch of Samuel D. Thompson in 2023.

Democratic

 * Loretta Weinberg, District 37

Republican

 * Kip Bateman, District 16
 * Thomas Kean Jr., District 21 (running for NJ-07 in 2022)

In addition, five members who were elected in the last election in 2017 have since left office: Robert M. Gordon (D-38th, resigned), Jeff Van Drew (D-1st, resigned), Anthony R. Bucco (R-25th, died in office), Gerald Cardinale (R-39th, died in office), and Chris A. Brown, (R-2nd, resigned after previously announcing retirement).

Close races
Seats where the margin of victory was under 10%:
 * 1) District 8, 2.22% gain
 * 2) District 3, 3.36% gain
 * 3) District 2, 3.74%
 * 4) District 11, 3.76%
 * 5) District 38, 5.80%
 * 6) District 16, 6.64% gain
 * 7) District 21, 7.30%
 * 8) District 4, 8.84%

General election

 * Polling


 * Predictions


 * Results

Republican primary

 * Polling

General election

 * Polling


 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

Republican primary
No Republicans filed. However, Clyde Cook received enough write-in votes to qualify for the general election.

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Polling


 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

Republican primary
Following the primary, Onuoha was replaced on the ballot for the general election by Pedro "Peter" Pisar on August 23.

General election

 * Predictions


 * Results

Candidates

 * Joseph Cryan, incumbent state senator since 2018
 * Jamel Holley, state assemblyman from Roselle since 2015

Withdrew
 * Jason Krychiw, suspended campaign on April 23, 2021

Republican primary
No Republicans filed.

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

Candidates

 * Daniel Cruz, member of the Andover Township Board of Education
 * Steve Oroho, incumbent senator since 2008

Democratic primary
No Democrats filed. However, Frederick P. Cook received enough write-in votes to qualify for the general election.

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

Republican primary
No Republicans filed.

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

Candidates

 * Nicholas Sacco, incumbent senator since 1994 and Mayor of North Bergen

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

Republican primary
Republicans Chris Auriemma filed to run, withdrew, and then received enough write-in votes to qualify for the general election.

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results

Candidates

 * Joseph Lagana, incumbent senator since 2018

General election

 * Predictions


 * Results

Candidates

 * Holly Schepisi, incumbent senator since 2021

General election

 * Predictions


 * Results

General election

 * Predictions


 * Results