The 2020 United States Senate election in Massachusetts was held on November 3, 2020, to elect a member of the United States Senate to represent the Commonwealth of Massachusetts, concurrently with the 2020 U.S. presidential election, as well as elections to the United States Senate in other states, elections to the United States House of Representatives and various state and local elections. On September 1, incumbent Senator Ed Markey defeated U.S. Representative Joe Kennedy III in a competitive primary for the Democratic nomination and Kevin O'Connor defeated Shiva Ayyadurai for the Republican nomination. Markey went on to win the general election with 66.2% of the vote, and was thus re-elected to a second full term in a landslide.