Conor McGregor -- I'M POSING NUDE

Irish eyes are smiling ... 'cause Conor McGregor is taking it all off for ESPN The Magazine's Body Issue.

ESPN just revealed its list of athletes who have signed on to go naked for the magazine's annual spread ... and as usual, it includes athletes of all shapes and sizes.

Among the models ... Von Miller, Greg Louganis, Dwyane Wade and Vince Wilfork.

That's right ... all 325 pounds of VW are coming your way!

Here's a few more stars from the list:

Antonio Brown (NFL), Courtney Conlogue (surfer), Christen Press (soccer), April Ross (beach volleyball), Allysa Seely (paratriathlete), Elena Delle Donne (WNBA), Jake Arrieta (MLB).