Petra Rivers (born 11 December 1952) is a retired Australian athlete who specialised in the javelin throw. At the 1970 National Championships, she won both the Open and Junior javelin titles. Still only seventeen, it was her fourth national junior javelin championship win. Her performances earned her a place in the Australian team for the 1970 Commonwealth Games where she comfortably won the gold medal in Edinburgh. Rivers went on to compete in the 1984 LA Olympics and 1986 Commonwealth Games.