DeMarcus De'Juan Nelson (born November 2, 1985) is an American former professional basketball player.

Nelson played at the shooting guard position on the Duke Blue Devils men's basketball team.

He was recalled by the Warriors on December 16, 2008, but he was waived on January 6, 2009, to make room for Jermareo Davidson.

[3] Nelson joined the Croatian Adriatic League club KK Zagreb in January 2009, but only played a single game.

[14] In April 2014, along with his teammate Boban Marjanović, he was selected to the Ideal Team of the 2013–14 ABA League season.

[18][19] On September 25, 2015, he signed a one-month deal with the French team Monaco, with the role to replace injured Larry Drew II.

[20] On December 23, 2015, he signed for the rest of the season with the Spanish team Unicaja, with the role to replace injured Stefan Marković.