The women's BMX racing competition at the 2012 Olympic Games in London took place at the BMX track at the Velopark within the Olympic Park, from 8 to 10 August.

[1] Mariana Pajón from Colombia won the gold medal — the only at the 2012 Games for the country — with a winning time of 37.706 seconds.

Sarah Walker from New Zealand won the silver medal and Laura Smulders of the Netherlands took bronze.

The riders were seeded into semi-finals based on time trials.

The semi-finals consist of three runs, with the top four riders in each group advancing to the final.