Oscar Tenner (sometimes Oskar) (Hebrew: אוסקר טנר‎; 5 April 1880, in Lemberg – 24 December 1948) was a Galicia (Poland)-born German–American chess master. At the beginning of his career, he played in several tournaments in Germany. He won (elim.) and took 4th at Hamburg 1910 (DSB Congress, C tournament), took 7th at Berlin 1911 (Carl Ahues won), tied for 9-10th at Breslau 1912 (DSB-Congress, Hauptturnier A, Bernhard Gregory won), shared 3rd at Jungbunzlau (Mlada Boleslav) 1913 (Karel Hromádka won), and tied for 2nd-3rd with Ilya Rabinovich, behind B. Hallegua, at Mannheim 1914 (interrupted DSB-Congress, Hauptturnier A).