Sebastián Fernández (born 8 September 1973) is an Argentine professional golfer. Fernández was born in Buenos Aires. He worked as a caddie in Buenos Aires, before turning professional in 1991. He won the Argentine Tour Order of Merit in 2000. He won three Argentine PGA Championships, in 1991, 2001 and 2005, the first as an 18-year-old, and also came second in 2003.