Vassilis Krommidas (Greek: Βασίλης Κρομμύδας, born July 4, 1970, in Thessaloniki) is a triathlete and coach from Greece best known for competing at the 2000 and 2004 Olympic Games.
Krommidas is a graduate of the Aristotle University of Thessaloniki with a degree in Physical Education and Sports Sciences.
He started his competitive career as a swimmer at the age of ten and later became a member of the Greek national swimming team.
He completed the swim in 18:20 but was forced to withdraw from the race during the cycling stage due to technical problems with his bike.
He has coached triathlete Deniz Dimaki, nine-time Greek national champion who participated in the women's triathlon in 2008 Summer Olympics in Beijing and has won a bronze medal at the ETU European Duathlon Championships in the same year.