These are the official results of the Men's Decathlon competition at the 1988 Summer Olympics in Seoul, South Korea. There were a total number of 39 participating athletes, with five competitors who didn't finish the competition.
These were the standing world and Olympic records (in points) prior to the 1988 Summer Olympics.
(*) Originally score according to the 1962/1977 tables.
(**)Score according to the 1985 tables.
Thompson's mark was not a world record in 1984, but when the 1985 tables came into use, his mark became the record. They were both given credit to the world record.