| Election Name: | 1928 United States Senate election in Washington |
| Country: | Washington |
| Flag Image: | Flag of Washington (1923–1967).svg |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1922 United States Senate election in Washington |
| Previous Year: | 1922 |
| Next Election: | 1934 United States Senate election in Washington |
| Next Year: | 1934 |
| Election Date: | November 6, 1928 |
| Image1: | File:Clarence Cleveland Dill.jpg |
| Nominee1: | Clarence Dill |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 261,524 |
| Percentage1: | 53.42% |
| Nominee2: | Kenneth Mackintosh |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 227,415 |
| Percentage2: | 46.45% |
| Map Size: | 270px |
| U.S. Senator | |
| Before Party: | Democratic Party (US) |
| After Party: | Democratic Party (US) |
The 1928 United States Senate election in Washington was held on November 6, 1928. Incumbent Democrat Clarence Dill was re-elected to a second term in office over Republican Chief justice Kenneth Mackintosh.
As of, this is the last time Washington elected a U.S. Senator from east of the Cascade Mountains.