Kenya competed at the 1984 Summer Olympics in Los Angeles, United States. After a twelve-year absence, the nation returned to the Olympic Games after boycotting both the 1976 and 1980 Games.

The men's marathon at the 1984 Summer Olympics in Los Angeles, California, was held on Sunday August 12, 1984. The race started at 5:00 pm local time. There were 107 competitors from 59 countries. The maximum number of athletes per nation had been set at 3 since the 1930 Olympic Congress. A total number of 78 athletes completed the race.