The women's discus throw competition at the 2012 Summer Olympics in London, United Kingdom was held at the Olympic Stadium on 3–4 August. Each athlete received three throws in the qualifying round. All who achieved the qualifying distance progressed to the final. If less than twelve athletes were to achieve this mark, then the twelve furthest throwing athletes would reach the final. Each finalist is allowed three throws in last round, with the top eight athletes after that point being given three further attempts.

The discus throw, also known as disc throw, is a track and field sport in which the participant athlete throws an oblate spheroid weight — called a discus — in an attempt to mark a farther distance than other competitors. It is an ancient sport, as demonstrated by the fifth-century-BC Myron statue Discobolus. Although not part of the current pentathlon, it was one of the events of the ancient Greek pentathlon, which can be dated back to at least 708 BC, and it is part of the modern decathlon.