The men's single sculls competition at the 1984 Summer Olympics took place at Lake Casitas, California, United States of America. The event was held from 31 July to 5 August. There were 16 competitors from 16 nations, with each nation limited to a single boat in the event. The event was won by Pertti Karppinen of Finland, his third consecutive victory. Silver went to Peter-Michael Kolbe of West Germany; Kolbe, who had also taken silver in 1976, was the ninth man to earn multiple medals in the single sculls and the first to do so in non-consecutive Games. Canada earned its first medal in the event since 1912 with Robert Mills's bronze. East Germany's three-Games podium streak ended with no rowers from that nation present due to the Soviet-led boycott.

Pertti Johannes Karppinen is a retired Finnish rower noted for his three consecutive Olympic gold medals in single sculls in 1976, 1980 and 1984.