| Election Name: | 1911 United States Senate election in New Jersey |
| Country: | New Jersey |
| Flag Year: | 1908 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1905 United States Senate election in New Jersey |
| Previous Year: | 1905 |
| Next Election: | 1916 United States Senate election in New Jersey |
| Next Year: | 1916 |
| Election Date: | January 24–25, 1911 |
| Votes For Election: | Resolution of the New Jersey Legislature |
| Image1: | File:James Edgar Martine circa 1915 (cropped).jpg |
| Nominee1: | James E. Martine |
| Party1: | Democratic Party (United States) |
| Electoral Vote1: | 47 |
| Percentage1: | 59.5% |
| Nominee2: | Edward C. Stokes |
| Party2: | Republican Party (United States) |
| Electoral Vote2: | 21 |
| Percentage2: | 26.6% |
| Image3: | File:Griggs2.jpg |
| Nominee3: | John W. Griggs |
| Party3: | Republican Party (United States) |
| Electoral Vote3: | 5 |
| Percentage3: | 6.3% |
| Senator | |
| Before Election: | John Kean |
| Before Party: | Republican Party (United States) |
| After Election: | James Edgar Martine |
| After Party: | Democratic Party (United States) |
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.
Prior to passage of the Seventeenth Amendment to the United States Constitution, New Jersey elected United States senators by a resolution of the New Jersey Legislature.
On September 13, 1910, direct "advisory" primaries were held. 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. Fowler.[1] Thus, Martine or Stokes stood likely to be elected Senator if their respective party won the 1910 fall legislative elections.
Martine carried every county, though no Democratic vote was reported in Ocean County or Cape May.[1]
Despite Martine's victory, the primary was non-binding. Former Senator James Smith Jr., who broke his alliance with Martine and Woodrow Wilson, pledged to challenge him in the January legislative election.
The Senate was unable to reach a choice on January 24, so both houses met in joint session on January 25 to elect Martine.