For the swimming competitions at the 2012 Summer Olympics the following qualification systems were in place. The list has been updated to 20 August 2011. Qualification ends on 3 July 2012.
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Qualifying standards
A National Olympic Committee (NOC) may enter up to 2 qualified athletes in each individual event if both meet the Olympic Qualifying Time (OQT). 1 athlete per event can potentially qualify should they meet the Olympic Selection Time (OST) and if the quota of 900 athletes has not been met. NOCs may enter swimmers regardless of time (1 swimmer per sex) if they have no swimmers meeting either standard entry time.
The qualifying time standards must be obtained in Continental Championships, National Olympic Trials or International Competitions approved by FINA in the period 1 March 2011 to 3 July 2012.
FINA qualifying standards are as follows:
Individual events
Only those with the Olympic Qualifying Time (OQT) are listed below as on the FINA website as those with the Olympic Selection Time are not guaranteed a place in the Olympic Games. Named swimmers have qualified personally through national selection meets or have been nominated by their National Olympic Committee (NOC).
The result is here:
Men's 100 m backstroke
* Chris Walker-Hebborn qualified in this event by an allocated quota, following a sudden withdrawal of Israel's Jonatan Kopelev.
Men's 400 m individual medley
* to be confirmed by NF/NOC
Women's 400 m individual medley
* to be confirmed by NF/NOC