| Election Name: | 1920 United States Senate election in Indiana |
| Country: | Indiana |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1916 United States Senate special election in Indiana |
| Previous Year: | 1916 (special) |
| Next Election: | 1926 United States Senate election in Indiana |
| Next Year: | 1926 |
| Election Date: | November 2, 1920 |
| Nominee1: | James E. Watson |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 681,851 |
| Percentage1: | 54.57% |
| Nominee2: | Thomas Taggart |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 514,191 |
| Percentage2: | 41.15% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Election: | James E. Watson |
| Before Party: | Republican Party (United States) |
| After Election: | James E. Watson |
| After Party: | Republican Party (United States) |
The 1920 United States Senate election in Indiana took place on November 2, 1920. Incumbent Republican Senator James E. Watson was re-elected to a full term in office over Thomas Taggart in a rematch of the 1916 special election for the same seat.