1940 United States Senate election in Pennsylvania

The 1940 United States Senate election in Pennsylvania was held on November 5, 1940. Incumbent Democratic U.S. Senator Joseph F. Guffey successfully sought re-election to another term, defeating the Republican nominee, Jay Cooke.

As of 2023, this is the last time that Mifflin County and Montour County voted Democratic in a Senate election. This was also the last time until 1991 that Democrats won this Senate seat, and the last until 2006 that they were elected to this seat for a full term.

Candidates

 * Joseph F. Guffey, incumbent U.S. Senator (Democratic)
 * Jay Cooke (Republican)

Results

 * -bgcolor="#EEEEEE"
 * colspan="3" align="right" | Totals
 * align="right" | 3,997,020
 * align="right" | 100.00%
 * align="right" |
 * }
 * }