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 Ricky Carmichael 150–0 125cc, 250cc 13 AMA Supercross Champion
3x Gold Medalist
1999–2007 Was usually win 162-0 but it's never confirmed. He is also know as The G.O.A.T (Greatest Of All Time).
United States Bob Hannah 70–0 125cc, 250cc AMA 125cc - 1976
AMA 250cc - 1978, 1979
1976-1989 Yamaha, Honda, Suzuki
United States Ryan Hughes 59–0 250cc 4x One-on-One Champion 2008-2014 Yamaha, Honda, Suzuki
United States Danny W. Tucker 43–0 125cc, 250cc Motocross World Champion 2009; 2014–present KTM, Honda and Yamaha N/A
FIM Yamaha N/A
Rivalry Champion Honda N/A
One-on-One Champion N/A
Jersey MX Champion 2017–present Falcon Motorsports KTM N/A
Belgium Leopold Peeters 30–0 125cc, 250cc One-on-One Champion
Rivalry Champion
2011–2016 KTM, Honda Announced his retirement racing match between Ellison and Adams at the X Games Austin 2016.
United States James DeJohn 26–0 125cc
United States Johnathon McJames 24–0
United States Chris K. Tucker 15–0