Oscar Blansaer (13 November 1890 – 23 June 1962) was a Belgian long-distance runner. He competed in the marathon at the 1920 Summer Olympics. He was also the runner-up in 5000 metres at the 1912 Flanders championships.Athlétisme, Les championnats des Flandres, Le Vingtième Siècle . 19 juni 1912
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