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.
- John A. Farrell
- Boies Penrose, incumbent U.S. Senator
|Republican||Boies Penrose (incumbent)||1,067,989||59.94%|
|Democratic||John A. Farrell||484,362||27.18%|
|Prohibition||Leah C. Marion||132,610||7.44%|
|Socialist||L. Birch Wilson, Jr.||67,316||3.78%|
|Socialist Labor||Robert J. Wheeler||27,401||1.54%|
|Single Tax||Joseph E. Jennings||2,110||0.12%|
- "Statistics of the Congressional and Presidential Election of November 2, 1920" (PDF). Office of the Clerk of the U.S. House. Retrieved 8 July 2014.