Ronald Odair de Oliveira Julião (born 16 June 1985) is a Brazilian track and field athlete who competes in the shot put and discus throw.
He is a member of BM&F Bovespa's track club and is trained by João Paulo Alves da Cunha.
He is the Brazilian record holder in the discus throw (65.55 m).
He is the second highest ranked South American discus thrower after Jorge Balliengo and has won straight titles at the Brazil championships since 2005.
Julião is a five-time medallist in the discus at the South American Championships in Athletics and won the gold medal in the event in 2011 with a Championship record.
He also won a silver medal in the shot put at the 2009 South American Championships.
He won bronze medals in the discus at the Pan American Games and Summer Universiade in 2011.