Swimming at the 2024 Summer Olympics – Mixed 4 × 100 metre medley relay

The mixed 4 x 100 metre medley relay event at the 2024 Summer Olympics will be held on 2 August 2024 at the Paris Aquatics Centre.

Records
Prior to this competition, the existing records were as follows.

Qualification
For the relays, a maximum of 16 qualifying teams in each event must be permitted to accumulate a total of 112 relay teams; each NOC may enter only one team. The top three teams in each relay race at the 2023 World Aquatics Championships in Fukuoka, Japan will directly book a slot for their corresponding event at the Olympics, while the remaining thirteen vying for qualification per relay race must attain their best time from the heats and finals at the combined 2023 and 2024 meet in Doha.

Competition format
The competition consists of three rounds: heats, semifinals, and a final. The swimmers with the best 16 times in the heats advance to the semifinals. The swimmers with the best 8 times in the semifinals advance to the final. Swim-offs are used as necessary to break ties for advancement to the next round.

Schedule
All times are Central European time (UTC+1)