Rankings are based not only on best times but also sustained excellence, medals won, and versatility across various distances.
1) 
Usain Bolt: 8 Olympic golds and 11 World Championship golds
Usain Bolt: 8 Olympic golds and 11 World Championship golds100 m: 9.58-current world record (Berlin 2009)
200 m: 19.19-current world record (Berlin 2009)
400 m: 45.28 (Kingston 2007)
4 x 100 m relay: 36.84-current world record (London 2012)
4 x 100 m relay: 36.84-current world record (London 2012)
2) 
Carl Lewis: 6 Olympic golds and 6 World Championship golds
Carl Lewis: 6 Olympic golds and 6 World Championship golds100 m: 9.86 (Tokyo 1991)
200 m: 19.75 (TAC/Mobile Championships 1983)
4 x 100 m relay: 37.40 (Barcelona 1992)
4 x 100 m relay: 37.40 (Barcelona 1992)
3) 
Michael Johnson: 4 Olympic golds and 8 World Championship golds
Michael Johnson: 4 Olympic golds and 8 World Championship golds100 m: 10.09 (Knoxville 1994)
200 m: 19.32-currently 3rd all time (Atlanta 1996)
400 m: 43.18-current world record (Sevilla 1999)
4) 
Jesse Owens: 3 Olympic golds
Jesse Owens: 3 Olympic golds100 m: 10.2 (Berlin 1936)
200 m: 21.1 (Berlin 1936)
5) 
Yohan Blake: 1 Olympic gold (2 silvers) and 2 World Championship golds
Yohan Blake: 1 Olympic gold (2 silvers) and 2 World Championship golds60 m: 6.75 (New York 2008)
100 m: 9.69- currently 2nd all time (Kingston 2012)
200 m: 19.26- currently 2nd all time (Brussels 2011)
4 x 100 m relay: 36.84-current world record (London 2012)
4 x 100 m relay: 36.84-current world record (London 2012)
6) 
Tyson Gay: 1 Olympic silver and 3 World Championship golds
Tyson Gay: 1 Olympic silver and 3 World Championship golds100 m: 9.69-currently 2nd all time (Shanghai 2009)
200 m: 19.58- currently 5th all time (New York 2009)
400 m: 44.89 (Gainesville 2010)
7) 
Maurice Greene: 2 Olympic golds and 5 World Championship golds
Maurice Greene: 2 Olympic golds and 5 World Championship golds60 m: 6.39-current world record (Madrid 1998 and Atlanta 2001)
100 m: 9.79 (Athens 1999)
200 m: 19.86 (Stockholm 1997)
8) 
Justin Gatlin: 1 Olympic gold and 3 World Championship golds
Justin Gatlin: 1 Olympic gold and 3 World Championship golds60 m: 6.45-currently 5th all time (Boston 2005)
100m: 9.74-currently 5th all time (London 2012)
200m: 19.57 (Starkville 2002)
9) 
Jim Hines: 2 Olympic gold
Jim Hines: 2 Olympic gold100 m: 9.95- first to officially break the 10-second barrier, a record he held for 15 years (Mexico City 1968)
10) 
Asafa Powell: 1 Olympic gold and 2 World Championship golds
Asafa Powell: 1 Olympic gold and 2 World Championship golds100 m: 9.72-currently 3rd all time (Lausanne 2008)
200 m: 19.90 (Kingston 2006)
400 m: 45.94 (Sydney 2009)
Note: medals won in other field events are not counted in totals (notably long jump golds for Owens and Lewis)
what abot haile gebrselassce
Sheeeeeeeeeeeeeeeeeeshh
2012 was the greatest 100m race of all time. Insane lineup.
That just isn’t the 400m record anymore, Wayde van Niekerk has it now, from 2016
Ferdinand Omanyala