These are the official results of the Men's Decathlon competition at the 1991 World Championships in Tokyo, Japan. There were a total number of 27 participating athletes, excluding three non-starters, and the competition starting on Thursday August 29, 1991, and ending on Friday August 30, 1991.
The highest mark recorded in each event is highlighted in yellow. These marks were split between six competitors with the gold medallist claiming five of them. As of 2024, this is the only time a decathlete has claimed the best score for more than four events at these championships.