Muhammad Ali vs. Henry Cooper II was a professional boxing match contested on 21 May 1966, for the WBC, NYSAC, and The Ring championship.

[1] On 16 April 1966 Muhammad Ali signed to make the fourth defence of the title he had won against Sonny Liston in June 1963, against Henry Cooper.

The fight held the record for the largest live audience at a British boxing event, up until Joe Calzaghe vs. Mikkel Kessler drew 55,000 spectators in 2007.

[3] It was the first world heavyweight title bout to be held in the United Kingdom since Tommy Burns vs. Jem Roche in March 1908, 58 years earlier.

[5]Confirmed bouts:[6] On pay-per-view closed-circuit television, the fight drew 40,000 buys in England, where it was shown in 16 theaters, grossing $1.5 million ($14,086,154 with inflation).