Bannister represented Australia at the 2008 and 2012 Olympics, and won gold at the Delhi Commonwealth Games in 2010.
He died suddenly in Holland where he had been living, according to reports.
“Athletics Australia is saddened and shocked to learn of the death of Jarrod Bannister,” said a statement released by the governing body.
“Jarrod’s mark of 89.02m is the current Australian record in javelin, set in Brisbane in 2008.
“Two years later, he won gold for his performance at the Delhi Commonwealth Games.
"It was the highlight of the many occasions that Bannister represented Australia which also included the Melbourne Commonwealth Games in 2006 and Beijing Olympic Games in 2008, and the 2011 IAAF World Championships in Daegu, South Korea.”