The 4 × 100 metre mixed medley relay competition of the swimming events at the 2015 World Aquatics Championships was held on 5 August with the heats and the final.[1]
Prior to the competition, the existing world and championship records were as follows.
The following new records were set during this competition
The heats were held at 10:49.[2]
The final was held at 19:19.[3]
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