A National Olympic Committee (NOC) may enter a maximum of two qualified athletes in each individual event, but 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 878 athletes has not been targeted. NOCs may also permit swimmers regardless of time (one per gender) under a Universality place, since they have no swimmers reaching either of the standard entry times (OQT/OST). In the relay events, a maximum of 16 qualifying teams in each relay event must be permitted to accumulate a total of 112 relay teams; each NOC may enter only one team. The first twelve teams in each relay event at the
2019 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 during the process. Swimmers from NOCs, having achieved the OST allocated to the universality place, may be entered to a maximum of two individual events, whereas those without the OQT and OST were limited to enter in one individual event only. == Individual events ==