At the 2012 Summer Olympics on 4 August 2012, Pistorius became the first amputee runner to compete at an Olympic Games. Oscar competes in the heats of the 400m at the Olympic Games, finishing second in a time of 45.44s which qualifies him for the semi-final.
In the semi-final, Oscar finishes eighth in a time of 46.54s. The South African relay team eventually finished eighth out of the field of nine in the final on 10 August. However, it established a season's best time for the team of 3 minutes 3.46 seconds, with Pistorius running the final leg in 45.9 seconds.
Pistorius was chosen to carry the South African flag for the closing ceremony.