Promotion officials announced the signing on Monday. Terms of the deal have not been disclosed.
At just 21 years of age, Koreshkov (8-0) has already made waves two years into his professional mixed martial arts career. Ranked as Bloody Elbow's No. 1 welterweight prospect, "Spartan" has ripped through all eight of opponents in decisive fashion, with six finishes ending in the first round.
Koreshkov last competed against "The Ultimate Fighter 11" alum Kyacey Uscola, where he needed just four minutes to blast through the veteran and earn a TKO victory.
"The international market has produced some incredible talent for us, and Andrey is near the very top of that list," said Bellator Chairman & CEO Bjorn Rebney. "Our Talent Development team, lead by Sam Caplan continues to be at the forefront of international scouting, and we'll continue bringing the best talent from across the world to Bellator."
A debut date for Koreshkov is yet to be determined, though promotion officials expect the youngster to participate in Bellator's upcoming sixth season.