Arthur Lemarcus Banks III, commonly known as Marcus Banks (born November 19 1981 in Las Vegas, Nevada), is an American professional basketball player who currently plays for the Miami Heat of the NBA. On February 6, 2008 Banks and Shawn Marion would depart from the Phoenix Suns to the Miami Heat for the Heat's Shaquille O'Neal who is now with the Suns.

Banks is 6'2" (188 cm) tall and 200 lb (90 kg). He played in college for the University of Nevada, Las Vegas (UNLV), where he was Co-Defensive Player of the Year as a senior. He was selected with the thirteenth pick in the first round of the 2003 NBA Draft by the Memphis Grizzlies, then traded to the Celtics along with Kendrick Perkins.