Kazuhiro Koizumi (小泉 和裕, Koizumi Kazuhiro, born 16 October 1949) is a Japanese conductor who has had an active international career since the 1970s.

Koizumi was one among the founding conductors of the New Japan Philharmonic established in July 1972.

Since 2006 he has been a current principal guest conductor with the Sendai Philharmonic Orchestra.

In 1973, he was awarded first prize at the Herbert von Karajan International Conducting Competition in Berlin.

He then served as the music director of the New Japan Philharmonic for many years.