Gerhardus Marinus Maria Nijboer (Dutch: [ɣeːˈrɑrdʏs maːˈrinʏs maːˈrijaː ˈnɛibuːr]; born 18 August 1955) is a Dutch former long-distance runner.

Nijboer competed in three consecutive Summer Olympics, starting in 1980 (Moscow, Soviet Union), when he won the silver medal in the marathon.

[1] He became European champion in the marathon in 1982, for which he was named Dutch Sportsman of the year.

His personal best time was 2:09:01 at the Amsterdam Marathon of 26 April 1980, which was at the time the second best marathon ever (after Derek Clayton's 2:08:34 run in 1969).

This biographical article relating to Dutch athletics is a stub.