Nine is the stage name of Derrick Keyes (born September 19, 1969), an American rapper from The Bronx, New York City, New York. He also been known as 9MMM or Nine Double M.

He debuted in 1985 in a group called Ricochet And Centipede. The group released one single called “Charlie Brown”.

He is known for his harsh, gravelly flow and distinctive voice, Keyes got his break in late 1993 as a featured guest on Funkmaster Flex and the Ghetto Celebs' “Six Million Ways to Die”.