Conor Anthony McGregor is an Irish professional mixed martial artist who is currently signed to the Ultimate Fighting Championship (UFC). He is the reigning UFC Lightweight Champion and former UFC Featherweight Champion. During his career, McGregor has competed as a featherweight, lightweight, and welterweight.

In 2008, McGregor started his mixed martial arts (MMA) career and, in 2012, he won both the Cage Warriors Featherweight and Lightweight Championships, holding both titles concurrently before vacating them to sign with the UFC. In 2015, at UFC 194, McGregor defeated José Aldo for the featherweight championship via knockout after thirteen seconds in the first round. This was the fastest victory in UFC title fight history. Upon defeating Eddie Alvarez for the UFC Lightweight Championship, at UFC 205, McGregor became the first fighter in UFC's history to hold titles in two divisions simultaneously