Chikahiko Koizumi (小泉 親彦, Koizumi Chikahiko, 9 September 1884 – 13 September 1945) was a Japanese military physician.

After graduating from Tokyo Imperial University,[1] he joined the Japanese Medical Corps.

[1] He was the Minister of Health and Welfare from 1941 to 1944 under the Konoe and Tōjō cabinets.

[1] He worked positively for the prevention of tuberculosis and advocated universal health care.

But Koizumi committed suicide by seppuku before he was arrested by the Allied occupation forces.