Mikkel Kessler (born 1 March 1979) is a Danish former professional boxer who competed from 1998 to 2013. He held multiple super-middleweight world championships, including the World Boxing Association (WBA) title (Super and Regular versions) three times between 2004 and 2013, and the WBC title twice between 2006 and 2010.

Kessler was born to a Danish father and an English mother, Ann, who hails from Salisbury, Wiltshire. He began his vocation early, training in boxing gyms at age 13.

Kessler competed five years as an amateur (2/93-1/98). He finished his amateur career with a record of 44 wins and three losses. He won the 1995 European Cadet (15-16 age group) Championship, 1996 and 1997 Danish Junior Championships, the 1996 Nordic Amateur Championship, and in his last amateur bout won the 1998 Zealand International Tournament after stopping all 3 of his opponents.

Kessler originally campaigned as a light middleweight and then middleweight for the first 22 fights of his career.

After 3 years and 22 fights, Kessler settled in the super middleweight division. Kessler continued his hard hitting streak, dispatching 6 of his first 7 opponents by KO, thereby improving his record to 29–0 with 22 KO.

On 29 November 2002, Kessler fought for his first championship and defeated former WBC Super Middleweight Champion Dingaan Thobela over twelve rounds to become the International Boxing Association Champion. He gave up this belt to fight for the more recognized WBC International title on 11 April 2003, versus Craig Cummings. Kessler won by a knockout in the third round.

He defended his title on three occasions before finally hitting it big on 12 November 2004. His stablemate, Mads Larsen, another Danish World Class fighter, was set to challenge Manny Siaca for the WBA Championship in Copenhagen. Larsen was injured in training and Kessler took the fight on short notice, winning the title.

Kessler defended his title against Anthony Mundine in Sydney in June 2005 and Eric Lucas in January 2006.