Sergey Sergeyevich Zasimovich (Russian: Серге́й Серге́евич Засимович; born 11 March 1986) is a Kazakhstani high jumper. He was born in Karagandinskaya. As a junior, he finished seventh at the 2004 Asian Junior Championships and twelfth at the 2005 Asian Championships, and won the gold medal at the 2005 Asian Indoor Games. In 2006 he finished fifth at the Asian Indoor Championships, but won the silver medal at the Asian Games. He furthermore won a silver at the 2007 Asian Indoor Games and the gold medal at the 2008 Asian Indoor Championships.