Japanese physician (1884–1945)
 was a Japanese military physician.
After graduating from Tokyo Imperial University, he joined the Japanese Medical Corps. He became Army Surgeon General of the Imperial Japanese Army in 1934.
He was the Minister of Health and Welfare from 1941 to 1944 under the Konoe and Tōjō cabinets. He worked positively for the prevention of tuberculosis and advocated universal health care.
After the war, he was accused of war-crimes as he was the minister when the war broke out. But Koizumi committed suicide by seppuku before he was arrested by the Allied occupation forces.
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