The 2026 United States Senate election in Massachusetts was held on November 3, 2026, to elect a member of the United States Senate to represent the Commonwealth of Massachusetts. Democratic incumbent Ed Markey was re-elected to a third full term, defeating Republican attorney John Deaton.
Primary elections were held on September 1. Markey won the Democratic nomination over Representative Seth Moulton with 64.9% of the vote. Deaton, the Republican nominee in 2024, was nominated a second time after running unopposed in the primary.
Democratic primary
Candidates
Nominee
- Ed Markey, incumbent U.S. senator (2013–present)
Eliminated in primary
- Seth Moulton, U.S. representative from Massachusetts's 6th congressional district (2015–present) and candidate for president in 2020
Eliminated in convention
- William F. Gates Jr., professor and architect
Withdrawn
- Alex Rikleen, history teacher (endorsed Markey)
Declined
- Jake Auchincloss, U.S. representative for Massachusetts's 4th congressional district (2021–present) (running for re-election)
- Ayanna Pressley, U.S. representative for Massachusetts's 7th congressional district (2019–present) (running for re-election; endorsed Markey)
Endorsements
Ed Markey
- Bernie Sanders, Vermont (2007–present) (Independent)
- Elizabeth Warren, Massachusetts (2013–present)
- Katherine Clark, House minority whip (2023–present) from MA-05 (2013–present)
- Bill Keating, MA-09 (2011–present)
- Jim McGovern, MA-02 (2013–present)
- Richard Neal, MA-01 (1989–present)
- Alexandria Ocasio-Cortez, NY-14 (2019–present)
- Lori Trahan, MA-03 (2019–present)
- Ayanna Pressley, MA-07 (2019–present)
- Andrea Campbell, attorney general of Massachusetts (2023–present)
- Paul DePalo, governor's councilor from the 7th district (2021–present)
- Michael Barrett, state senator from the 3rd Middlesex district (2013–present)
- William Brownsberger, president pro tempore of the Massachusetts Senate (2019–present) from the 2nd Suffolk and Middlesex district (2012–present)
- Nick Collins, state senator from the 1st Suffolk district (2018–present)
- Julian Cyr, state senator from the Cape and Islands district (2017–present)
- Sal DiDomenico, state senator from the Middlesex and Suffolk district (2010–present)
- Brandy Fluker-Reid, state representative from the 12th Suffolk district (2021–present)
- Homar Gomez, state representative from the 2nd Hampshire district (2025–present)
- Russell Holmes, state representative from the 6th Suffolk district (2011–present)
- Pat Jehlen, state senator from the 2nd Middlesex district (2005–present)
- Mary Keefe, state representative from the 15th Worcester district (2013–present)
- Edward Kennedy, former state senator from the 1st Middlesex district (2019–2025) (deceased)
- Robyn Kennedy, state senator from the 1st Worcester district (2023–present)
- David LeBoeuf, state representative from the 17th Worcester district (2019–present)
- Jason Lewis, state senator from the 5th Middlesex district (2014–present)
- Joan Lovely, state senator from the 2nd Essex district (2013–present)
- Liz Miranda, state senator from the 2nd Suffolk district (2023–present)
- Michael Moore, state senator from the 2nd Worcester district (2009–present)
- Susan Moran, former state senator from the Plymouth and Barnstable district (2020–2025)
- Therese Murray, former president of the Massachusetts Senate (2007–2015) from the Plymouth and Barnstable district (1993–2015)
- Marc Pacheco, former state senator from the 1st Plymouth and Bristol district (1993–2025)
- Michael Rodrigues, state senator from the 1st Bristol and Plymouth district (2011–present)
- Lindsay Sabadosa, state representative from the 1st Hampshire district (2019–present)
- Dan Wolf, former state senator from the Cape and Islands district (2011–2017)
- 29 other state representatives
- Kevin Hayden, district attorney of Suffolk County (2022–present)
- Paul Heroux, sheriff of Bristol County (2023–present)
- Peter Koutoujian, sheriff of Middlesex County (2011–present) and former state representative from the 10th Middlesex district (1997–2011)
- Jon Mitchell, mayor of New Bedford (2012–present)
- Jared Nicholson, mayor of Lynn (2022–present)
- Joseph Petty, mayor of Worcester (2012–present)
- Marian Ryan, district attorney for Middlesex County (2013–present)
- Michelle Wu, mayor of Boston (2021–present)
- Ed Flynn, Boston city councilor from the 2nd district (2018–present)
- 10 other Boston city councilors
- Ken Burns, filmmaker
- Alex Rikleen, history teacher and former candidate for this seat
- Massachusetts AFL-CIO
- American Federation of Government Employees
- American Federation of State, County, and Municipal Employees Council 93
- American Federation of Teachers Massachusetts
- Boston Teachers Union
- Association of Flight Attendants
- Brotherhood of Locomotive Engineers and Trainmen
- Committee of Interns and Residents
- International Brotherhood of Electrical Workers Local 103
- International Association of Machinists and Aerospace Workers State Council
- Massachusetts Teachers Association
- Massachusetts Nurses Association
- National Association of Government Employees Local 5000
- North Atlantic States Regional Council of Carpenters
- SEIU 32BJ
- SEIU Locals 1199, 888 and 509
- Teamsters Local 122
- UNITE HERE Local 26
- United Food and Commercial Workers Locals 328, 791, 1445, and 1459
- Armenian National Committee of America
- Christopher Street Project
- College Democrats of Massachusetts
- End Citizens United
- Human Rights Campaign
- J Street
- Jewish Democratic Council of America
- Joint Action Committee for Political Affairs
- League of Conservation Voters
- Natural Resources Defense Council
- Our Revolution
- Planned Parenthood Action Fund
- Population Connection
- Progressive Change Campaign Committee
- Progressive Democrats of America
- Reproductive Freedom for All
- Sunrise Movement
- Voters of Tomorrow
- Massachusetts Democratic Party
Seth Moulton
- Chrissy Houlahan, PA-06 (2019–present)
- Seth Magaziner, RI-02 (2023–present)
- Max Rose, former NY-11 (2019–2021)
- Pat Ryan, NY-18 (2023–present)
- Derek Tran, CA-45 (2025–present)
- Mikie Sherrill, governor of New Jersey (2026–present)
- John Cronin, state senator from the Worcester and Middlesex district (2021–present)
- Tim Miller, political strategist and writer for The Bulwark
- Iron Workers Local 7
- International Brotherhood of Electrical Workers Locals 104, 1499, and 2325
- Plumbers and Gasfitters Local 12
- Teamsters Joint Council 10 and Locals 3, 25, 42, 59, 127, 170, 404, and 653
- Utility Workers Union of America
- Democrats for Education Reform
- VoteVets
Fundraising
Italics indicate a withdrawn candidate
Polling
Aggregate polls
Convention
Candidates must win at least 15% at the party convention in order to make it onto the primary ballot. The convention decides which candidate gets the party's endorsement for the primary election while the primary decides the party nominee for the general election.
Republican primary
Candidates
Nominee
- John Deaton, attorney and nominee for U.S. Senate in 2024
Eliminated at convention or did not file
- Christopher Thrasher, Westport School Committee Chair and nominee for Massachusetts House of Representatives' 8th Bristol district in 2024
Withdrawn
- Nathan Bech, former West Springfield City Councilman and nominee for Massachusetts's 1st congressional district in 2008 (running as an independent)
Declined
- Charlie Baker, president of the National Collegiate Athletic Association (2023–present) and former Governor of Massachusetts (2015–2023)
- Michael Soter, state representative from the 8th Worcester district (2019–present)
Endorsements
John Deaton
Fundraising
Italics indicate a withdrawn candidate.
Third parties and independents
Party for Socialism and Liberation
Candidates
Independents
Candidates
- Shiva Ayyadurai, perennial candidate
- Nathan Bech, former West Springfield City Councilman and Republican nominee for Massachusetts's 1st congressional district in 2008
- Morgan Dawicki
- Philip Devincentis
General election
Post-primary endorsements
Ed Markey (D)
Joe Tache (PSL)