Ernest Mateen (June 3, 1966 – November 6, 2012, in Bedford-Stuyvesant, Brooklyn, New York), nicknamed 'M-16', was a United States and IBU Cruiserweight (boxing) champion.
M-16 Mateen remained an amateur, and in 1989 repeated as 178 pound Open Champion again by defeating Jade Scott of the Police Athletic League in the New York Golden Gloves championship final.
M-16 Mateen also defeated Kevin Watts, Dale Jackson, and Drake Thadzi (who later defeated James Toney), fighters with a combined 65 wins, en route to winning the Nevada State and World Boxing Council Continental Americas Light heavyweight boxing title and rising as high as # 2 in the world ratings, before losing his title in the tenth round to Charles Williams (boxer).
M-16 Mateen went on to decision John Scully twice, later known as the trainer of Chad Dawson, and drew with future Cruiserweight (boxing) champion O'Neil Bell.
In his last two fights, M-16 Mateen lost to future top contender Matt Godfrey, but finished his career with a ten-round unanimous decision over veteran Terry Porter in Memphis, Tennessee, on June 10, 2006, leaving the ring a winner at age 40.