Leonid Alfonsovich Ostrovski (Russian: Леонид Альфонсович Островский, Latvian: Leonīds Ostrovskis; 17 January 1936 in Riga – 17 April 2001 in Kyiv) was a Latvian footballer and then when Latvia was occupied - Soviet football player and manager of Jewish origin. He is the greatest and most accomplished Latvian footballer in history, being the only Latvian who has played in the World Cup.