| Election Name: | 1925 United States Senate special election in Wisconsin |
| Country: | Wisconsin |
| Flag Year: | 1913 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1922 United States Senate election in Wisconsin |
| Previous Year: | 1922 |
| Next Election: | 1928 United States Senate election in Wisconsin |
| Next Year: | 1928 |
| Election Date: | September 29, 1925 |
| Image1: | File:RMLaFolletteJr.jpg |
| Nominee1: | Robert La Follette Jr. |
| Party1: | Republican Party (US) |
| Popular Vote1: | 237,719 |
| Percentage1: | 67.51% |
| Party2: | Independent Republican (United States) |
| Popular Vote2: | 91,318 |
| Percentage2: | 25.93% |
| U.S. Senator | |
| Before Party: | Republican Party (United States) |
| After Party: | Republican Party (United States) |
| Map Size: | 250px |
The 1925 United States Senate election in Wisconsin was held on September 29, 1925, to complete the unexpired term of U.S. Senator Robert La Follette, who died on June 18.
The seat was won by La Follette's son and personal secretary, Robert M. La Follette Jr. over mostly Republican opposition. He defeated three candidates in the Republican primary and overcame a challenge from fellow Republican Edward F. Dithmar, running on a "Coolidge & Dawes Platform" ticket.