| Election Name: | 1938 United States Senate election in New Jersey |
| Country: | New Jersey |
| Flag Year: | 1896 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1934 United States Senate election in New Jersey |
| Previous Year: | 1934 |
| Next Election: | 1940 United States Senate election in New Jersey |
| Next Year: | 1940 |
| Election Date: | November 8, 1938 |
| Image1: | William Warren Barbour.jpg |
| Nominee1: | William Warren Barbour |
| Party1: | Republican Party (US) |
| Popular Vote1: | 816,667 |
| Percentage1: | 52.98% |
| Party2: | Democratic Party (US) |
| Popular Vote2: | 704,159 |
| Percentage2: | 45.68% |
| Map Size: | 280px |
| U.S. senator | |
| Before Party: | Democratic Party (US) |
| After Party: | Republican Party (US) |
The United States Senate special election of 1938 in New Jersey was held on November 8, 1938.
The vacancy was created when incumbent Senator A. Harry Moore resigned to become Governor of New Jersey. Interim appointee John Gerald Milton did not run in the election.
Former Republican U.S. Senator William Warren Barbour returned to the Senate after defeating Democrat William H. J. Ely, the state administrator of the Works Progress Administration.