| Election Name: | 1920 United States Senate election in North Dakota |
| Country: | North Dakota |
| Flag Year: | 1914 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1914 United States Senate election in North Dakota |
| Previous Year: | 1914 |
| Next Election: | 1926 United States Senate special election in North Dakota |
| Next Year: | 1926 (special) |
| Election Date: | November 2, 1920 |
| Image1: | File:LADD, E.F., DOCTOR LCCN2016859947 (cropped).jpg |
| Nominee1: | Edwin F. Ladd |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 130,614 |
| Percentage1: | 59.61% |
| Nominee2: | H. H. Perry |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 88,495 |
| Percentage2: | 40.39% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Election: | Asle Gronna |
| Before Party: | Republican Party (United States) |
| After Election: | Edwin F. Ladd |
| After Party: | Republican Party (United States) |
The 1920 United States Senate election in North Dakota took place on November 2, 1920. Incumbent Senator Republican Senator Asle Gronna ran for re-election to a third term. However, he was narrowly defeated in the Republican primary by Edwin F. Ladd, the President of the North Dakota Agricultural College, who had been endorsed by the Nonpartisan League. In the general election, Ladd was opposed by H. H. Perry, the Democratic nominee and a Democratic National Committeeman. As Republican presidential nominee Warren G. Harding overwhelmingly won North Dakota over Democratic nominee James M. Cox, Ladd also staked out a wide victory—though his margin of victory was not as large as Harding's.