Aron Nimzowitsch (or Aron Isayevich Nimtsovich, or Aaron Nimzovich) (Latvian: Arons Nimcovics born Aron Niemzowitsch) (7 November 1886 – 16 March 1935) was a Russian-born, Danish leading chess master and a very influential chess writer. He was the foremost figure amongst the hypermoderns.
Born in Riga in Livonia, then part of the Russian Empire, the Jewish German-speaking Nimzowitsch came from a wealthy family, where he learned chess from his father, who was a merchant. In 1904, he travelled to Berlin to study philosophy, but set aside his studies soon and began a career as a professional chess player that same year. He won his first international tournament at Munich 1906. Then, he tied for first with Alexander Alekhine at St. Petersburg 1913/14 (the eighth All-Russian Masters' Tournament).