Cliffton Nirgel Alexander (born November 16, 1995) is an American professional basketball player for the Guaiqueríes de Margarita of the Superliga Profesional de Baloncesto (SPB). He completed his freshman season at the University of Kansas for the Jayhawks' on their 2014–15 team. He declared himself eligible for the 2015 NBA draft but was undrafted. He played one season for the Portland Trail Blazers and earned a second year of NBA service with the Brooklyn Nets.
He played in high school at Curie High School in Chicago where he won Naismith and Mr. Basketball USA recognition as national player of the year. He did not play organized basketball until eighth grade, but by late in his freshman season he became a notable contributor to his high school's varsity team. He was ranked among the top 20 prospects in the national class of 2014 prior to his sophomore season. As a junior, he moved into the top 10 of the national class and was recognized as an All-American. By the beginning of his senior season, he was considered to be a top 5 player by most talent evaluators and his stock was still on the rise. Following a Martin Luther King Day performance during his senior year against the number one team in the country, many experts considered him to be the best player in the national class of 2014.