up until now:10/23/2008
Floyd mayweather - retired this year
rockey marciano a heavy weight champion in the 50's.
sven ottke - a German super middle weight retired a few years ego.
Lopez a fly weight Mexican champ.
Joe Calzaghe a welsh fighter who recently beat people like roy Jones jr and bernard Hopkins, a pound for pound boxer, mostly light heavyweight.
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Joe Calzaghe; Floyd Mayweather Jr. Buy a current issue of RING magazine. Go to the Ratings page(s). There beside names you can browse won-loss-drawn records of all the very top active list (& rated) boxers; their will be many more names you do not see because the rating process has various competeing interests. You will see quite a few boxers with undefeated records in those ratings. Both Managers and boxers work very hard to preserve a unblemished record as-long-as possible.
Rocky Marciano was the only heavyweight boxer who became world champion and never lost a fight.