Gunnar Nelson is a professional Jiu Jitsu BJJ) and Mixed Martial Arts (MMA) fighter from Iceland. One of the strongest competitors in the European grappling scene, Gunnar became a household name in the sport after placing fourth in the ADCC tournament (open weight division) in 2009. Gunnar Nelson has been one of the youngest Europeans to have received a BJJ black belt (he was 21 years old) and with only 4 years of training.