Nine cities submitting bids to host the 2012 Summer Olympics and 2012 Summer Paralympics[a] were recognised by the International Olympic Committee (IOC). The Committee shortlisted five of them—London, Madrid, Moscow, New York City, and Paris—from which London eventually prevailed; thus becoming the first city to host the Olympic Games for a third time. The bidding process for the 2012 Olympics was considered one of the most hotly contested in the history of the IOC. Paris was seen by some as the front-runner for much of the campaign, but skillful lobbying by London's supporters and an inspirational final presentation by Sebastian Coe led to the success of its bid.

The 117th International Olympic Committee Session was held for the first time in Singapore from 2 to 9 July 2005. Two important decisions were made through voting during the session – namely the selection of the hosting city for the 2012 Summer Olympics, and a review of the 28 sports currently represented in the summer games.