This is a list of world champions in professional motocross who retired undefeated, either during or after a title reign(s). It excludes current titleholders. Each champion's record is shown in the following format: wins–losses–draws–no contests.

Racer Record Motocross class Title(s) Years active Team(s) Notes
United States Ryan Hughes 81–0–5 (1) 250cc 4x One-on-One Champion 2008-2014 Yamaha, Honda, Suzuki
United States Bob Hannah 70–0–2 (0) 125cc, 250cc AMA 125cc - 1976
AMA 250cc - 1978, 1979
1976-1989 Yamaha, Honda, Suzuki
United States Francis Marchegiano 59–0–0 (0) 125cc, 250cc Motocross World Champion 1999–2016 KTM, Honda and Yamaha
United States Danny W. Tucker 59–0–0 (0) 98cc, 150cc, 250cc, 450cc X Games 2010–present KTM, Honda and Yamaha
FIM 2014–2018 Yamaha Retired at 59–0 in 2018; returned one week later.
Rivalry Champion 2007–2014 Honda Vacated title in 2014.
OnO GP Champion 2017–present
Jersey MX Champion 2017–present Falcon Motorsports KTM Jersey MX Debut.
United States Joshua Dwight 49–0–0 (0) 250cc 4x One-on-One Champion 1975-1984 Yamaha, Honda, Suzuki
Belgium Leopold Peeters 40–0–0 (0) 125cc, 250cc One-on-One Champion
Rivalry Champion
2011–2016 KTM, Honda Announced his retirement racing match between Tucker and Adams at the X Games Austin 2016.
United States Seth Sutter 30–0–0 (0) 98cc, 125cc, 250cc AMA 98cc champion 2007–2015 Husqvarna, Kawasaki, Honda Announced his retirement on April 26, 2015.
United States Chris K. Tucker 28–0–0 (0)
United States James DeJohn 26–0–0 (0) 125cc
United States Johnathon McJames 24–0–0 (0)
Mexico Juan David Escribano 7–0–3 (0)