The men's 100 metre backstroke competition at the 2023 World Aquatics Championships was held on 24 and 25 July 2023.
Prior to the competition, the existing world and championship records were as follows.
The heats were started on 24 July at 10:51.
The semifinals were started on 24 July at 20:17.
The final was held on 25 July at 20:59.
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