1817 Massachusetts's 1st congressional district special election

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A special election was held August 26, 1817 in {{ushr|MA|1}} to fill a vacancy left by the resignation of Representative-elect James Lloyd (F) before the beginning of the 15th Congress.

Mason was seated December 2, 1816.{{cite web | url=https://historycms2.house.gov/WorkArea/DownloadAsset.aspx?id=40204 | title=Fourteenth Congress March 4, 1815 to March 3, 1817 | access-date=January 11, 2019 | publisher=Office of the Historian, United States House of Representatives | via=History.house.gov | archive-date=October 22, 2018 | archive-url=https://web.archive.org/web/20181022033542/https://historycms2.house.gov/WorkArea/DownloadAsset.aspx?id=40204 | url-status=dead }}