Gerard Cornelis Adrianus Oskam (12 April 1880, The Hague – 7 May 1952) was a Dutch chess master.
During World War I, he tied for 3rd–5th at Rotterdam 1915, shared 2nd at Scheveningen 1915, tied for 7–8th at Amsterdam 1916, twice shared 1st in The Hague and Scheveningen in 1917, won at Rotterdam 1918, twice tied for 5–6th in Arnheim and Scheveningen in 1918, and shared 1st with Jan Willem te Kolsté at 's Hertogenbosch 1918 (Quadrangular).
[1] Oskam represented the Netherlands in 1st unofficial Chess Olympiad at Paris 1924.
He obtained his Master of Laws at the University of Amsterdam in 1906[3] and subsequently had a practice in Rotterdam.
In April 1910 he married Sara van Laar from Amsterdam.