The 2018 United States Senate election in Massachusetts took place on November 6, 2018. Incumbent Democratic U.S. Senator Elizabeth Warren ran for re-election to a second term. The candidate filing deadline was June 5, 2018, and the primary election was held on September 4, 2018.
Warren won re-election, defeating her Republican opponent, state Representative Geoff Diehl.
Democratic primary
Candidates
Nominated
- Elizabeth Warren, incumbent U.S. senator
Republican primary
Candidates
Nominated
- Geoff Diehl, state representative
Eliminated in primary
- John Kingston, attorney and founder and president of Better for America
- Beth Lindstrom, former undersecretary of the Massachusetts Office of Consumer Affairs and Business Regulation
Eliminated at convention
- Darius Mitchell
- Heidi Wellman
Declined
- Gabriel Gomez, businessman, former Navy SEAL and nominee for the U.S. Senate in 2013
- Rick Green, businessman (running for House of Representatives)
- Curt Schilling, former Major League Baseball pitcher
- Bill Weld, former governor, nominee for the U.S. Senate in 1996 and Libertarian nominee for Vice President of the United States in 2016 (endorsed Beth Lindstrom)
- Daniel Winslow, former state representative and candidate for the U.S. Senate in 2013
Endorsements
Beth Lindstrom
Governors
- William F. Weld, former governor of Massachusetts, 1991-1997
State legislators
- Jay Barrows, state representative
- Kimberly Ferguson, state representative
- Paul Frost, state representative
- Sheila Harrington, state representative
- Bradford Hill, state representative
- Steven Howitt, state representative
- James Kelcourse, state representative
- David Muradian, state representative
- Elizabeth Poirier, state representative
- Richard J. Ross, state senator
- David Vieira, state representative
- Donald Wong, state representative
Local officials
- Mark Hawke, Gardner mayor
- Anne Manning-Martin, Peabody city councilor at-large
Organizations
- Maggie's List
- New England Police Benevolent Association
- RightNOW Women PAC
- Value in Electing Women (VIEW) PAC
Newspapers
- The Boston Globe
- The Lowell Sun
John Kingston
State legislators
- Donnie Berthiaume, state representative
- Will Crocker, state representative
- Vinny deMacedo, state senator
- Ryan Fattman, state senator
- Don Humason, state senator
- Joseph D. McKenna, state representative
Local officials
- Lew Evangelidis, Worcester County sheriff
- Stephanie K. Fattman, Worcester County register of probate
- Jim Kane, member of the Shrewsbury Board of Selectmen
- Eddie Tedesco, Woburn city councilor
Individuals
- Jim Rappaport, former chairman of the Massachusetts GOP
Results
By county
Results by county. Red represents counties won by Diehl. Teal represents counties won by Kingston.
Libertarian primary
Candidates
Declined
- Bill Weld, former Republican governor and nominee for vice president of the United States in 2016
Independents
Candidates
Declared
- Shiva Ayyadurai, entrepreneur and conspiracy theorist
- John Devine
- Allen Waters
Declined
- Gabriel Gomez, businessman, former Navy SEAL and Republican nominee for the U.S. Senate in 2013
General election
Endorsements
Elizabeth Warren (D)
Geoff Diehl (R)
U.S. executive branch officials
- Mike Pence, 48th vice president of the United States
- Sean Spicer, former White House Press Secretary
Governors
- Charlie Baker, Massachusetts
- Paul LePage, Maine
State legislators
- Nick Boldyga, state representative
- Forrester Clark, former state representative
- Leah Cole, former state representative
- Robert Correia, former state representative (Democrat)
- David DeCoste, state representative
- Peter Durant, state representative
- Marc Lombardo, state representative
- Jim Lyons, state representative
- Lenny Mirra, state representative
- Shaunna O'Connell, state representative
Local officials
- Caroline Colarusso, Stoneham selectwoman
- John Coutinho, Hopkinton selectman
- Jim Cummings, Barnstable County sheriff
- Lewis Evangelidis, Worcester County sheriff
- Bob Hedlund, Weymouth mayor
- Tom Hodgson, Bristol County sheriff
- Michael Marchese, Everett city councilor at-large
- John McCaul, Taunton city councilor
- Joe McDonald, Plymouth County sheriff
- Monica Medeiros, Melrose alderman
- Ken Mitchel, Hanson Board of Selectman chair
- Jeff Postell, Taunton city councilor
- Claire Wright, Hopkinton selectwoman
Individuals
- Herman Cain, former presidential candidate
- Howie Carr, radio talk host
- David Constantine, former governor's councilor
- Larry Ellison, president of the Massachusetts Association of Minority Law Enforcement Officers
- Steve Grogan, retired New England Patriots player
- Jeff Kuhner, hadio host
- Matt Light, retired New England Patriots player
- Joe Malone, former state treasurer
- Dave Marciano, boat captain on Wicked Tuna
- Frank McNamara, former U.S. attorney
- Stephen Moore, writer and economist
- Fred Smerlas, retired New England Patriots player
Organizations
- Association of County Employees (the Union of Plymouth County Corrections Officers)
- The Association of Marshfield Police
- Boston Police Patrolmen’s Association
- Everett Police Patrolman's Local 94
- Everett Police Superior Officers Local 95
- ICE Council Local 207
- Massachusetts Police Association
- Massachusetts Republican Party (MassGOP), Massachusetts branch of the United States Republican Party
- New Bedford Police Union
- New England Police Benevolent Association
- Norfolk Sheriff's Office County Correctional Officers Association
- NRA Political Victory Fund
- Worcester's NEPBA Local 911
- Youth Conservatives of Massachusetts
Newspapers
Debates
- Complete video of debate, October 19, 2018
- Complete video of debate, October 21, 2018
Predictions
^Highest rating they assert
Results
By congressional district
Warren won all of the state’s congressional districts.