John Kean Republican James Edgar Martine Democratic The 1911 United States Senate election in New Jersey was held on January 24–25, 1911.

Republican incumbent John Kean did not run for re-election to a third term.

The open seat was won by Democrat James Edgar Martine with Republican former Governor Edward C. Stokes as the runner-up.

Martine defeated John McDermitt of Newark for the Democratic nomination, while Stokes narrowly won a three-way Republican primary against former Governor Franklin Murphy and U.S. Representative Charles N.

Former Senator James Smith Jr., who broke his alliance with Martine and Woodrow Wilson, pledged to challenge him in the January legislative election.