Mike Tyson(He has a MUCH better chin than people give him credit for)
Sugar Ray Robinson
Oliver McCall
James Toney(Sure, he was knocked down a few times but mostly due to off balance. Example of that is the Roy Jones Jr fight)
My list reads like this:
1. Aaron Pryor
2. Marvin Hagler
3. Muhammad Ali
4. Henry Armstrong
5. Sugar Ray Robinson
Marvin hagler
Muhammad Ali
Sugar Ray Robinson
Sam Langford
Henry Armstrong
Marvin Hagler
Shane Mosley
James Toney
Azumah Nelson
Aaron Pryor
1. Marvin Hagler
2. Muhammad Ali
3. Kid Gavilan
4. Mike McCallum
5. Sugar Ray Robinson
Muhammad Ali
Charley Burley
Mike Tyson
George Foreman (late career, especially)
Joe Frazier
there are too many
Ali,Foreman and Frazier all had granite chins.Ray Robinson,Marvin Hagler,Sam Langford,Tyson(some may dispute Tyson but he had a great chin on him) shane mosely ect.