Sorin Mihai Căliniuc (born 12 July 1996) is a Romanian professional kickboxer and Olympic boxer, and former kempo practitioner.

Căliniuc worked simultaneously as a casino security guard until he met coach and promoter Estéfano Tănăsescu Popescu who enrolled him to a gym.

[3][4] With a background of being IKF world kempo champion, Căliniuc began his kickboxing career by winning his first four fights by decision.

[6][7] Căliniuc faced Bogdan Costan on November 2, 2018, in the semifinals of the Lightweight Tournament at SAS Gym 01.

[9] Căliniuc defeated Ostrovanu via unanimous 3-round decision to become the inaugural Colosseum Tournament World Super Lightweight Champion.

[11] Căliniuc dominated the fight and won via unanimous 5-round decision to become the Colosseum Tournament World Lightweight Champion.

However, due to the Russian invasion of Ukraine, Zuev removed from the card and he was replaced by Andre Mannaart's Sami Lamiri.

[18] Căliniuc was finally scheduled to make his third title defense against former Wu Lin Feng World Championship Champion Nafi Bilalovski (Filip Verlinden Gym) on June 23, 2022, at Colosseum Tournament 33.

[20] Căliniuc was once again scheduled to defend his title against WKN World Super Welterweight Champion Jordi Requejo, in September, 2022, at Colosseum Tournament 35.