Nélson Cabral Semedo (born 16 November 1993) is a Portuguese professional footballer who plays for Spanish club Barcelona and the Portugal national team as a right-back.

He began his career at Sintrense before joining Benfica in 2012. After spending a season on loan at Fátima, he initially appeared for Benfica B, before making his first-team debut in 2015 and going on to win back-to-back Primeira Liga titles, among other honours. In July 2017 he signed with Barcelona, winning the La Liga championship in his first two seasons.

Semedo made his senior debut for Portugal in October 2015, and represented the nation in the 2017 Confederations Cup and 2018–19 UEFA Nations League, winning the latter tournament.