For the swimming competitions at the 2016 Summer Olympics, the following qualification systems were in place. Qualification ended on 3 July 2016.
A National Olympic Committee (NOC) may enter a maximum of 2 qualified athletes in each individual event, only if both athletes have attained the Olympic Qualifying Time (OQT). One athlete per event can potentially enter if they meet the Olympic Selection Time (OST) or if the quota of 900 athletes has not been targeted. NOCs may also permit swimmers regardless of time (1 per gender) under a Universality place, as long as they have no swimmers reaching either the standard entry time.
In the relay events, a maximum of 16 qualifying teams in each relay event must be permitted to accumulate a total of 96 relay teams; each NOC may enter only one team. The first twelve teams in each relay event at the 2015 World Championships will automatically compete for the relay events at the Olympics; while the remaining four per relay event must obtain their fastest entry times based on the FINA World Rankings of 31 May 2016 during the process.
Following the end of the qualification period, FINA will assess the number of athletes having achieved the OQT, the number of relay-only swimmers, and the number of Universality places, before inviting athletes with OST to fulfill the total quota of 900. Additionally, OST places will be distributed by event according to the position of the FINA World Rankings during the qualifying deadline (3 July 2016).
The qualifying time standards must be obtained in World Championships, Continental Championships, Continental Qualification Events, National Championships and Trials, or International Competitions approved by FINA in the period between 1 March 2015 to 3 July 2016.
FINA qualifying standards are as follows:
Those who have achieved the Olympic Qualifying Time (OQT) or the Olympic Selection Time (OST), or have been guaranteed a Universality place are listed below for each of the following individual events:
° Unused host quota place
^ Unused continental quota place
° Unused host quota place
^ Unused continental quota place