The 1881 United States Senate election in Pennsylvania was held on thirty separate dates from January to February 1881. On February 23, 1881, John I. Mitchell was elected by the Pennsylvania General Assembly to the United States Senate.
The Pennsylvania General Assembly, consisting of the House of Representatives and the Senate, convened on January 27, 1881, to elect a Senator to serve the term beginning on March 4, 1881. Thirty-five ballots were recorded on thirty separate dates spanning from January 27 to February 23, 1881. The results of the thirty-fifth and final ballot of both houses combined are as follows:
|Republican||John I. Mitchell||150||59.76|
|Democratic||William A. Wallace (Inc.)||92||36.65|
- "U.S. Senate Election - 27 January 1881 - 23 February 1881" (PDF). Wilkes University. Retrieved 23 December 2012.
- "PA US Senate - 1881". OurCampaigns. Retrieved 22 December 2012.