| Election Name: | 1940 United States Senate election in Michigan |
| Country: | Michigan |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1934 United States Senate election in Michigan |
| Previous Year: | 1934 |
| Next Election: | 1946 United States Senate election in Michigan |
| Next Year: | 1946 |
| Election Date: | November 5, 1940 |
| Image1: | File:Arthur H. Vandenberg.jpg |
| Nominee1: | Arthur Vandenberg |
| Party1: | Republican Party (US) |
| Popular Vote1: | 1,053,104 |
| Percentage1: | 52.65% |
| Nominee2: | Frank FitzGerald |
| Party2: | Democratic Party (US) |
| Popular Vote2: | 939,740 |
| Percentage2: | 46.98% |
| Map Size: | 300px |
| U.S. Senator | |
| Before Election: | Arthur Vandenberg |
| Before Party: | Democratic Party (US) |
| After Election: | Arthur Vandenberg |
| After Party: | Republican Party (US) |
The 1940 United States Senate election in Michigan was held on November 5, 1940.
Republican Senator Arthur Vandenberg was re-elected to a third consecutive term over Democratic judge Frank FitzGerald.