Swimming at the 1988 Summer Olympics – Men's 4 × 100 metre medley relay

The men's 4 × 100 metre medley relay event at the 1988 Summer Olympics took place on 25 September at the Jamsil Indoor Swimming Pool in Seoul, South Korea.

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

The following new world and Olympic records were set during this competition.

Heats
Rule: The eight fastest teams advance to the final (Q).