| Election Name: | 1920 United States Senate election in Washington |
| Country: | Washington |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1914 United States Senate election in Washington |
| Previous Year: | 1914 |
| Next Election: | 1926 United States Senate election in Washington |
| Next Year: | 1926 |
| Election Date: | November 2, 1920 |
| Nominee1: | Wesley L. Jones |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 164,130 |
| Percentage1: | 56.40% |
| Nominee2: | Clemens J. France |
| Party2: | Farmer-Labor Party |
| Popular Vote2: | 99,309 |
| Percentage2: | 25.80% |
| Nominee3: | George F. Cotterill |
| Party3: | Democratic Party (United States) |
| Popular Vote3: | 68,488 |
| Percentage3: | 17.80% |
| Map Size: | 275px |
| U.S. Senator | |
| Before Election: | Wesley Livsey Jones |
| Before Party: | Republican Party (United States) |
| After Election: | Wesley Livsey Jones |
| After Party: | Republican Party (United States) |
The 1920 United States Senate election in Washington was held on November 2, 1920. Incumbent Republican U.S. Senator Wesley Livsey Jones was re-elected to a third term in office over Farmer-Labor nominee Clemens J. France and former Seattle mayor George F. Cotterill.