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 78 different Kenyans have won 89 gold medals in a row.
2016 Conseslus Kipruto (new Olympic record)
2012 Ezekiel Kemboi
2008 Brimin Kipruto
2004 Ezekiel Kemboi
2000 Reuben Kosgei
1996 Joseph Keter
1992 Matthew Birir
1988 Julius Kariuki
1984 Julius Korir
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.