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Koshi (古志郡, Koshi-gun) was a district located in Niigata Prefecture, Japan.
As of 2003, the district had an estimated population of 2,035 with a density of 51.09 persons per km2. The total area is 39.83 km2.
Prior to its dissolution, the district contained of only one village:
Nakanoshima-machi, Koshiji-machi, Mishima-machi, Yamakoshi-mura and Oguni-machi were incorporated into Nagaoka-shi as of April 1, 2005.
平成17年4月1日に南蒲原郡中之島町、三島郡三島町、古志郡山古志村、刈羽郡小国町と一緒に長岡市に編入合併しました。