Billy Joe Saunders (born 30 August 1989) is an English professional boxer. He has held world championships in two weight classes, including the WBO super-middleweight title since 2019, and previously the WBO middleweight title from 2015 to 2018. Saunders is the first boxer from the Travelling community to become a two-weight world champion. At regional level he held the European, British, and Commonwealth middleweight titles between 2012 and 2015. As an amateur, Saunders represented Great Britain at the 2008 Olympics, reaching the second round of the welterweight bracket. In the same year, he won gold at the EU Championships.

As of December 2019, he is ranked as the world's second best active super-middleweight by BoxRec and sixth by The Ring. On 19 December 2015 Saunders made history by competing in the first world title fight contested between two members of the travelling community when he fought Andy Lee for the WBO middleweight title.