Kjell Gunnar Isaksson (born 28 February 1948) is a retired pole vaulter from Sweden, who broke the world record several times in 1972.
First he broke the record set by Christos Papanikolaou of Greece and San Jose State University two years earlier, by jumping 5.51 metres in Austin, Texas, becoming the second man to clear 18 feet.
A week later he improved it to 5.54 m in Los Angeles, California.
His technique inspired several aspects of the Petrov/Bubka model.
Two months later he added another centimeter at a meet in Helsingborg, Sweden.
His record reign was ended on 2 July 1972 when the reigning Olympic champion Bob Seagren jumped 5.63 m at the U.S.
Olympic Trials.
Isaksson set his personal best at 5.59 m in El Paso, Texas, on 23 May 1972.Isaksson competed at the 1968, 1972 and 1976 Olympics with the best result of tenth place in 1968.
In 1972 he was handicapped by a sudden change of rules by the IAAF and could not clear any height.
He appeared on the cover of Track and Field News several times starting in April 1971, then March, April and June 1972 (with Seagren).
Nationally he won the pole vault title in 1968–71 and 1973–79 and was active in bowling in the 2000s.