| Election Name: | 1920 United States Senate election in Pennsylvania |
| Country: | Pennsylvania |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1914 United States Senate election in Pennsylvania |
| Previous Year: | 1914 |
| Next Election: | 1922 United States Senate special election in Pennsylvania |
| Next Year: | 1922 (special) |
| Election Date: | November 2, 1920 |
| Nominee1: | Boies Penrose |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 1,067,989 |
| Percentage1: | 59.94% |
| Nominee2: | John A. Farrell |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 484,362 |
| Percentage2: | 27.18% |
| Nominee3: | Leah C. Marion |
| Party3: | Prohibition Party (United States) |
| Popular Vote3: | 132,610 |
| Percentage3: | 7.44% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Election: | Boies Penrose |
| Before Party: | Republican Party (United States) |
| After Election: | Boies Penrose |
| After Party: | Republican Party (United States) |
The 1920 United States Senate election in Pennsylvania was held on November 2, 1920. Incumbent Republican U.S. Senator Boies Penrose successfully sought re-election to another term, defeating Democratic nominee John A. Farrell.