Vasiliy Anatolyevich Lomachenko (also spelled Vasyl Anatoliyovych Lomachenko; Ukrainian: Василь Анатолійович Ломаченко, IPA: [wɐˈsɪlʲ lomɐˈtʃɛnko]; born 17 February 1988) is a Ukrainian former professional boxer who competed between 2013 and 2024. He has held multiple world championships in three weight classes, including the World Boxing Organization (WBO) featherweight title from 2014 to 2016, the WBO super featherweight title from 2016 to 2018, the unified World Boxing Association (WBA) (Super version), World Boxing Council (WBC), WBO, and Ring magazine lightweight titles from 2018 to 2020, and the International Boxing Federation (IBF) lightweight title from 2024 to 2025.
Lomachenko is one of the most successful amateur boxers of all time and often considered to be the greatest, possessing a record of 396 wins and 1 loss, with that loss avenged twice. Competing in the featherweight and lightweight divisions, he won a silver medal at the 2007 World Championships, gold at the 2008 European Championships, consecutive gold at the 2008 and 2012 Olympics, and consecutive gold at the 2009 and 2011 World Championships.