Consensus Rankings:   Official  |  Member Designed  |  This Ranking Updated 12 years ago  |  All By kILLuminate

1. 1

   

   Henderson vs. Bisping

   Dan Henderson in round 2

   2009 | UFC 100

   There is NO knockout in MMA history as brutal as this one.
   

2. 2

   

   Liddell vs. Evans

   Rashad Evans in round 2

   2008 | UFC 88

   I think even 'till today, there has never been a harder punch thrown. Tied at first with Henderson's H-Bomb on Bisping.
   

3. 3

   

   Barboza vs. Etim

   Edson Barboza in round 3

   2012 | UFC 142

   The first ever spinning heel kick knockout in UFC history. Etim was knock out COLD, face still, eyes rolled back, stiff body.
   

4. 4

   

   Jackson vs. Arona

   Quinton Jackson in round 1

   2004 | Pride Critical Countdown 2004

   The slam heard 'round the world part 1.
   

5. 5

   

   Silva vs. Belfort

   Anderson Silva in round 1

   2011 | UFC 126

   The nastiest front kick knock out ever. Silva threw nothing a few minutes into the fight and chants for Vitor were being yelled out. With his first strike, the greatest fighter of all time threw a front kick right to Vitor's face and Belfort was out cold.