Swimming at the 2024 Summer Olympics

The swimming competitions at the 2024 Summer Olympics in Paris are scheduled to run from 27 July to 9 August 2024. Pool events (27 July to 4 August) will occur at the Paris La Défense Arena, with the two-day marathon swimming (8 to 9 August) staged at Pont Alexandre III through the Seine River.

Events
Similar to the 2020 program format, swimming features a total of 37 events (18 each for men and women and 1 mixed event), including two 10 km open-water marathons. The following events were contested (all pool events are long-course, and distances are in meters unless stated):
 * Freestyle: 50, 100, 200, 400, 800, and 1500;
 * Backstroke: 100 and 200;
 * Breaststroke: 100 and 200;
 * Butterfly: 100 and 200;
 * Individual medley: 200 and 400;
 * Relays: 4 × 100 free, 4 × 200 free; 4 × 100 medley (men's, women's, and mixed)
 * Marathon: 10 kilometres

Schedule
The swimming program schedule for Paris 2024 will occur in two segments. For the pool events, similar to the case for the 2012 Games, prelims will run in the morning, followed by the semifinal and final sessions in the evening and the night session (due to the substantial fees NBC has paid for rights to the Olympics, the IOC has allowed NBC to have influence on event scheduling to maximize U.S. television ratings when possible; NBC agreed to a $7.75 billion contract extension on May 7, 2014, to air the Olympics through the 2032 Games and is also one of the major sources of revenue for the IOC). Several significant changes are instituted to the swimming schedule, with the program extending to nine days for the first time as opposed to the regular eight-day format. The extra day would be used to alleviate the schedules of the swimmers who would compete in the individual and relay events at the same period. Moreover, it relieves a packed schedule that witnesses three new events added to the program at the previous Games.

In February 2024, a change was announced to the original schedule for Days 5 and 6, after lobbying by the France's swimming governing body to give Leon Marchand a chance to win both the men's 200 metre butterfly and 200 metre breaststroke events. All events remain on the originally planned days, but the event order has been modified to create a longer gap between the 200 metre butterfly and 200 metre breaststroke events.

Individual events
World Aquatics establishes qualifying times for individual events. The time standards consist of two types, namely an "Olympic Qualifying Time" (OQT, colloquially known as the A-cut) and an "Olympic Consideration time" (OCT, colloquially known as the B-cut). Each country can enter a maximum of two swimmers per event, provided that they meet the (faster) qualifying time. A country can enter one swimmer per event that meets the invitation standard. Any swimmer who meets the "qualifying" time will be entered into the event for the Games; a swimmer meeting the "invitation" standard is eligible for entry allotted by ranking. If a country does not have a swimmer who meets either of the qualifying standards, it may have entered one male and one female. A country that does not receive an allocation spot but enters at least one swimmer achieving a qualifying standard might have entered those with the highest ranking.

Relay events
Each relay event features 16 teams, composed of the following:
 * 3: top three teams based on their final results achieved at the 2023 World Aquatics Championships in Fukuoka, Japan
 * 13: top thirteen teams, with the fastest times based upon the results achieved in their preliminary heat and finals performances in the 2023 World Aquatics Championships in Fukuoka and 2024 World Aquatics Championships in Doha, excluding those teams already qualified in that event from the 2023 World Aquatics Championships in Fukuoka.

All athletes entered in individual events can be used in relays, even if they have not achieved the OCT for the corresponding stroke and distance of the relay in which they are entered. Relay teams may compose of additional athletes according to the number of events they have qualified for.

Open-water swimming
The men's and women's 10 km races featured 22 swimmers each, three less than those in the Tokyo 2020 roster:


 * 3: the three medalists in the 10 km races at the 2023 World Aquatics Championships in Fukuoka, Japan
 * 13: the top thirteen swimmers vying for qualification at the 2024 World Aquatics Championships in Doha, Qatar
 * 5: one representative from each FINA continent (Africa, the Americas, Asia, Europe, and Oceania).
 * 1: from the host nation (France) if not qualified by other means. If one or more French open water swimmers qualify regularly and directly, their slots will be reallocated to the next highest-ranked eligible swimmers from the 2024 World Aquatics Championships.