As of the 2008 Games in Beijing, Australia has never won the most medals at a Summer Olympics. Their best finish was third at the 1956 Games in Melbourne when their 35 medals was beaten by the Soviet Union (98) and United States (74). The most medals Australia has won in a Summer Olympics is 58 (2000 Sydney) which placed them fourth behind the United States (94), Russia (88), and China (59).
There was no Summer Olympics in 2007.
1984 Summer Olympics in Los Angeles Canada won 44 medals.
The United States won the most Silver medals at the 2012 summer olympics. They achieved 29 silver medals as well as the most gold medals with 46 and the most total medals with 104.
In the London 2012 Summer Olympics, the Russian Federation won the most bronze medals, with 32.
the united states have won more medals at the summer and winter Olympics than any other country to take place in the summer and winter Olympics.
The USA won the most Gold Medals with 46 and the most Medals with 104
Michael Phelps holds the record for most gold medals in a single Olympics. He won 8 at the 2008 Summer Olympics.