Swimming at the 2024 Summer Olympics – Women's 100-metre backstroke

The US' defending Olympic bronze medallist and 2022 World Champion Regan Smith broke the world record at the 2024 US Olympic Trials with a time of 57.13. Defending Olympic champion Kaylee McKeown from Australia held the previous world record, and won the event at the 2023 World Championships. Both SwimSwam and Swimming World predicted that Smith would win, McKeown would come second and Berkoff would come third. The event was held at Paris La Défense Arena, which was converted to a swimming pool for the swimming events. == Qualification ==

Each National Olympic Committee (NOC) was permitted to enter a maximum of two qualified athletes in each individual event, but only if both of them had attained the Olympic Qualifying Time (OQT). For this event, the OQT was 59.99 seconds. World Aquatics then filled the rest of the event places with athletes qualifying through universality; NOCs were given one event entry for each gender, which could be used by any athlete regardless of qualification time, providing the spaces had not already been taken by athletes from that nation who had achieved the OQT. In total, 20 athletes qualified through achieving the OQT, while 16 athletes qualified through universality places. == Heats ==

Five heats (preliminary rounds) took place on 29 July 2024, starting at 11:13. Berkoff qualified with the fastest time of 57.99, Smith qualified in second and McKeown in third. Carmen Weiler broke Spain's national record by 0.19 seconds, setting it at 59.57 to qualify. == Semifinals ==

Two semifinals took place on 29 July, starting at 21:01. == Final ==

The final took place at 21:00 on 30 July. Over the last 50 metres, McKeown elevated herself to first to win the gold medal with a time of 57.33 seconds. She later went on to win the 200 metre backstroke as well, which made her the first swimmer to win both the 100 metre and 200 metre backstroke events at consecutive Olympics. Later at the Paris Games, Smith broke McKeown's Olympic record with a time of 57.28, which she swam in the opening leg of the women's 4 × 100 metre medley relay. Berkoff's bronze was the US' 3000th Olympic medal, and their 600th swimming medal. == Notes ==