Otto Rüster (Ruester, Ruster) (1895- ??) was a German chess master.
He represented Germany in 2nd unofficial Chess Olympiad at Budapest 1926.  He played several times in Silesian Chess Congress ,  and won at Breslau 1925 (the 4th SCC). After World War II , he lived in East Germany, and played at Jena 1953 (the 4th GDR-ch ). 
Before and after the war, he participated in many correspondence chess tournaments.
- Jump up^ http://www.olimpbase.org
- Jump up^ Chess In Former German, Now Polish Territories – Fred Van Der Vliet
- Jump up^ http://www.365chess.com/tournaments/DDR-ch_04th_1953