Gevorg "Giorgio" Petrosyan (born December 10, 1985) is an Armenian-Italian kickboxer who competes in the middleweight division. Nicknamed "The Doctor" and noted for his supreme technical skills, ringsmanship and defensive prowess which has seen him defeat some of the best strikers in the world while taking little-to-no damage, As of 5 March 2020, he is ranked the #3 lightweight in the world by Combat Press, and is widely regarded as one of the greatest kickboxers of all time.

After immigrating to Italy from Armenia at thirteen years old, Petrosyan began his professional career as a Muay Thai fighter at sixteen, starting out as a -54 kg/119 lb bantamweight before moving up through the weight classes and settling at the -70 kg/154 lb middleweight division, taking numerous titles along the way. Following a decision loss to Nonthanan Por. Pramuk at Lumpinee Stadium in January 2007, he went on a six-year, forty-two fight undefeated streak considered to be one of the most dominant reigns in the history of the sport which was eventually ended by Andy Ristie at Glory 12: New York in November 2013.

His switch to kickboxing rules and subsequent ascent began in 2008 when he began competing for It's Showtime and K-1, and he established himself as the world's top middleweight with two consecutive K-1 World MAX World Championship Tournament Championships in 2009 and 2010. He then joined Glory in 2012 following It's Showtime and K-1's demise and further cemented his place as the elite -70 kg/154 lb kickboxer by winning the Glory 2012 Lightweight Slam tournament.

Born in Yerevan, Armenian Soviet Socialist Republic, Soviet Union (now Armenia) on December 10, 1985 as Gevorg Petrosyan, he emigrated to Italy at the age of thirteen with his father, Andranik, and older brother, Stepan, arriving illegally in the country in the back of a truck. They initially lived homeless in Milan, sleeping in train stations and on the streets, but were later taken in by a family in Gorizia who offered them work as night watchmen at their factory. After settling in Italy, he was soon joined by his mother, Karine, sister, Lianna, and younger brother, Armen, who is also a world champion kickboxer.

Inspired by Bruce Lee and Jean-Claude Van Damme martial arts films, Petrosyan decided to begin training in Muay Thai at fourteen years old but was initially turned away from the gym for being too small.He persisted, however, and eventually started his training under Alfio Romanut at the Satori Gladiatorium Nemesis gym and had his first fight at the age of sixteen. He continues to reside in Gorizia in Northern Italy and worked as a bricklayer early in his career. Giorgio Petrosyan will take the place in Italy, with the management of the manager Carlo Di Blasi, of the international celebrity of martial arts, Paolo The Flex Biotti, official TV sparring partner of Don Wilson, considered the Italian first response to Dida Diafat, Ramon Dekkers and Pennacchio, whose career in great ascent toward the martial arts movies industry and the world title will be blocked by a mortal car accident that will take him a few years to the wheelchair, after several operations Biotti will return to fight, but only a few times, and then became one of the most famous sports manager in Europe.