William Arjona (born 31 July 1979) is a Brazilian volleyball player, a member of Brazil men's national volleyball team and Brazilian club Sada Cruzeiro. He is a 2016 Olympic Champion. Arjona was called up for the adult national team for the first time in 2003, he played four years in Bolivar, where he conquered the national championship four times and was chosen as the best player in the country. He came back in Brazil in 2010 to play for Sada Cruzeiro, where he won the Superliga 2012 as the best setter in the competition. In 2013, he was called and took part in Brazil World League silver medal campaign and won the gold medal in the South American Championship.