The anti-fur campaign launched Wednesday in Beijing, two days before the opening of the Games.
Beard has been called one of the sexiest athletes in the world and was featured in Playboy magazine in 2007.
The campaign was initiated by PETA (People Ethical Treatment of Animals).
"Seeing animals slaughtered to be worn as fashion is awful to me, so I'm definitely against wearing fur ... I'd much rather go naked than ever put a dead animal on my body," PETA quoted Beard as saying.
Photos of Beard will be featured in front of the Water Cube swimming venue, according to Reuters.