Karim Rasheed Mayfield (born December 14, 1980) is an American professional boxer who fights at welterweight.^[1] He is a former NABO junior welterweight champion.

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Mayfield was born and raised in San Francisco and grew up in the historic Fillmore District. He has three brothers and two sisters. His mother is an entrepreneur while his father is an electrician.

Karim Mayfield has fought 58 amateur fights altogether with a record of 54-4. He won the 2006 Golden Gloves in San Francisco at the historic Civic Center Auditorium in San Francisco. Mayfield also won the Bronze medal in the Western Trials for the 2004 Olympics.

Mayfield was a football player, running back, in school and discovered boxing at a relatively late age when he was 20 years old. There was a local gym around his neighborhood that had just opened and he decided to go check it out. Mayfield ended up sparring with an amateur boxer who had been boxing for a year and did extremely well. That inspired and motivated Mayfield to take up Boxing professionally. Mayfield is trained by Ben Bautista.

On June 23, 2006 Mayfield beat the veteran Chris Mickle to win his pro debut. This card also had future world champions Robert Guerrero and Andre Dirrell.^[2]

Mayfield first won the Vacant NABO Jr. Welterweight on October 1, 2011 in Tunica, Mississippi, via a 10 round unanimous decision against lefthanded former two-time Venezuelan Olympian Patrick Lopez (20-4).

On June 20, 2015 Floyd Mayweather Jr told ESPN Boxing reporter Dan Rafael^[3] that he was going to fight either Karim Mayfield or Andre Berto next. Most boxing scribes did not take this seriously, but Mayweather insisted^[4] that he was not joking, stating "Pacquiao fought (Chris) Algieri, so why not?"