Shimoniikawa (下新川郡, Shimoniikawa-gun) is a district located in Toyama Prefecture, Japan.

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As of 2003, the district has an estimated population of 49,118 with a density of 77.09 persons per km². The total area is 637.19 km².

The district consists of two towns:

• Asahi^{[lower-alpha 1]}
• Nyūzen^{[lower-alpha 1]}