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Published 09:13 7 Jun 2020 BST
Updated 09:15 7 Jun 2020 BST
Add us as a preferred source on Google »McGregor last fought earlier this year and beat Donald 'Cowboy' Cerrone in just 40 seconds in Las Vegas.
He took to Twitter earlier this morning to announce the news alongside a picture of his mother.
The post says - "Hey guys I’ve decided to retire from fighting. Thank you all for the amazing memories! What a ride it’s been!"
"Here is a picture of myself and my mother in Las Vegas post one of my World title wins! Pick the home of your dreams Mags I love you! Whatever you desire it’s yours
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