Xavier O'Callaghan Ferrer (born 2 March 1972) is a Spanish handball player who competed in the 2000 Summer Olympics and in the 2004 Summer Olympics.
He was born in Barcelona.
In 2000 he won the bronze medal with the Spanish team. He played three matches and scored five goals.
Four years later he finished seventh with the Spanish handball team in the 2004 Olympic tournament. He played six matches and scored eight goals.