is a railway station on the Taita Line in the city of Tajimi, Gifu Prefecture, Japan, operated by Central Japan Railway Company (JR Tokai).
Koizumi Station is served by the Taita Line, and is located 3.2 rail kilometers from the official starting point of the line at .
Koizumi Station has two opposed side platforms connected to the station building by a footbridge. The station has a Midori no Madoguchi staffed ticket office.
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Koizumi Station opened on December 28, 1918. It was relocated to its present location on October 1, 1928. The station was absorbed into the JR Tokai network upon the privatization of the Japanese National Railways (JNR) on April 1, 1987.
In fiscal 2016, the station was used by an average of 1,294 passengers daily (boarding passengers only).