Maybe there is more somewhere, but any nation will have done very well to beat the Kenyan streak in the 3000m Men's Steeplechase.
The last non-Kenyan to win the race was the Pole Bronisław Malinowski in 1980. Since then 8 different Kenyans have won 9 gold medals in a row.
As a side note, Kenya didn't appear in the 1980 Moscow Olympics, due to the US-led boycott, and also didn't appear in the 1976 Montreal Olympics, due to African disquiet about the partially ineffective boycott of Apartheid-era South Africa. They had previously won the 1968 and 1972 Steeplechase races too. So not since 1964 have a Kenyan team appeared at the Olympics and failed to take home the Gold medal for Steeplechase.