Eleftherios "Lefteris" Petrounias is a Greek artistic gymnast. He is the 2016 Olympic champion, 2020 Olympic bronze medalist, three-time World champion and a nine-time European medalist on the still rings. He was named the Greek Male Athlete of the Year, for the years 2015, 2016, 2017, and 2018.

Artistic gymnastics is a discipline of gymnastics in which athletes perform short routines on different apparatuses. The sport is governed by the Fédération Internationale de Gymnastique (FIG), which assigns the Code of Points used to score performances and regulates all aspects of elite international competition. Within individual countries, gymnastics is regulated by national federations such as British Gymnastics and USA Gymnastics. Artistic gymnastics is a popular spectator sport at many competitions, including the Summer Olympic Games.