Iwafune (岩船郡, Iwafune-gun) is a district located in Niigata Prefecture, Japan.

As of July 1, 2019, the district has an estimated population of 5,644 with a density of 18.2 persons per km. The total area is 309.39 km.

The district consists of two villages:

• Awashimaura
• Sekikawa

This list is incomplete; you can help by adding missing items. (March 2023)

Iwafune's name is from the Ancient Japanese Ritsuryo System. In 1878, when Iwafune District launched, the district covered all six towns listed above and the current city of Murakami, and the district areas has been the same since the founding. The district seat was located at Murakami-Honmachi (now part of the current city of Murakami).

After the district lost Murakami in 1954, the district areas remain the same as until April 1, 2008. There had been some talks to merge with the city of Murakami but the city of Murakami killed the merger because of the city's new name. However, the talks was finally settled.

• On April 1, 2008 - The towns of Sanpoku and Arakawa, and the villages of Asahi and Kamihayashi were merged into the expanded city of Murakami.

38°03′40″N 139°36′00″E / 38.061°N 139.60°E / 38.061; 139.60