Xinmi (), formerly Mi County (), is a county-level city of Henan Province, South Central China, it is under the administration of the prefecture-level city of Zhengzhou.
The archaeological Bronze Age site Xinzhai was found 1979 about southeast of Xinmi.
As of 2012, the city is divided to 4 subdistricts, 11 towns, 2 townships and 1 other.