Belinda Hocking comes from Albury, NSW but came through the AIS swimming program in Canberra. Hocking won three gold and two silver medals at the 2007 Australian Youth Olympic Festival. In 2008 she clocked the second fastest national time in the 100m backstroke and by 2009 the 200m backstroke record was hers. Hocking placed eighth in the 200m backstroke at the 2008 Beijing Olympic Games. She has since won back-to-back 200m backstroke titles at the Australian Championships in 2009 and 2010, as well as a bronze medal at the 2010 Pan Pacs in the same event.
Hocking performed strongly at the 2012 nomination trials when she won the 200m backstroke and finished second in the 100m backstroke to book her spot in the Australian Team for the London 2012 Games. She went on to finish seventh in the 100m backstroke in London as compatriot Emily Seebohm won silver. Hocking finished fifth in her 200m backstroke semi-final and missed the final.