Below are the 2018 MLS officials, along with their home state or province, and their first year in that position in the league:
Referees
United States
Fotis Bazakos
Allen Chapman
Ismail Elfath
Chico Grajeda
Alan Kelly
Jair Marrufo
Chris Penso
Jose Carlos Rivero
Nima Saghafi
Robert Sibiga
Kevin Stott
Baldomero Toledo
Ted Unkel
Armando Villarreal
Canada
Drew Fischer
Dave Gantar
Silviu Petrescu
Probationary Referees
United States
Alex Chilowicz
Marcos DeOliveira
Joe Dickerson
Tim Ford
Ramy Touchan
Rubiel Vazquez
Assistant Referees
United States
Frank Anderson
Ian Anderson
Kyle Atkins
Claudiu Badea
Peter Balciunas
Andrew Bigelow
Cameron Blanchard
Eric Boria
Logan Brown
Jose Da Silva
Brian Dunn
Adam Garner
Jeffrey Greeson
Jeremy Hanson
Jeff Hosking
Jonathan Johnson
Mike Kampmeinert
Kevin Klinger
Kyle Longville
Craig Lowry
Peter Manikowski
Apolinar Mariscal
Eduardo Mariscal
Felisha Mariscal
CJ Morgante
Jeff Muschik
Matt Nelson
Kathryn Nesbitt
Corey Parker
Brian Poeschel
Corey Rockwell
Mike Rottersman
Nick Uranga
Eric Weisbrod
Jason White
Adam Wienckowski
Canada
Philippe Briere
Gianni Facchini
Richard Gamache
Oscar Mitchell-Carvalho
Probationary Assistant Referees
United States
Gjovalin Bori
Chris Elliott
Jeremy Kieso
Cory Richardson
TJ Zablocki
Canada
Micheal Barwegan
Chris Wattam
Video Assistant Referees
United States
Jon Freemon
Geoff Gamble
Jorge Gonzalez
Edvin Jurisevic
Caleb Mendez
Kevin Terry Jr.
Probationary Video Assistant Referees
United States
Malik Badawi
Guido Gonzalez Jr.
Alejandro Mariscal
Daniel Radford
Victor Rivas
Ricardo Salazar
Sorin Stoica
Assistant Video Assistant Referees
United States
Tom Supple
Canada
Robert Schaap
Probationary Assistant Video Assistant Referees
United States
Jozef Batko
Joshua Patlak
