Tom DeBlass (born May 14, 1982) is an American Brazilian jiu-jitsu practitioner, submission grappler and mixed martial artist currently signed to ONE Championship.

DeBlass was a county champion long jumper at Central Regional High School, from which he graduated in 2000.

DeBlass was known primarily as a Brazilian Jiu-Jitsu competitor winning such titles as Pan American and World Championships.

DeBlass announced his retirement from MMA after the bout with Fukuda stating, "After a lot of talk with my family and coaches, I have decided to retire from fighting and focus on my family, my academy and helping my students to achieve their goals.

DeBlass was scheduled to face former IFL Light Heavyweight Champion Vladimir Matyushenko at Bellator 108 on November 15, 2013.

[16] In it, he revealed that he had suffered sexual abuse as a child and explained how he was able to overcome that in order to succeed as a BJJ and MMA competitor.

[19] DeBlass announced in February 2023 that he was working with other gym-owners across the United States in order to open a non-profit anti-bullying initiative, using Brazilian jiu-jitsu.