Welington Reginaldo "Nezinho" dos Santos, also commonly known simply as Nezinho (born 21 January 1981 in Araraquara) is a Brazilian former professional basketball player. He also represented the senior Brazilian national team. At a height of tall, he played at the point guard position.
Dos Santos was the Brazilian League's Sixth Man of the Year in 2010.
Dos Santos was a member of the senior Brazilian national basketball team. With Brazil, he played at some of the following major tournaments: the 2005 FIBA AmeriCup, the 2006 FIBA World Cup, the 2007 FIBA AmeriCup, the 2010 FIBA World Cup, and the 2011 FIBA AmeriCup.