Karnaz Subdistrict (Arabic: ناحية كرناز) is a subdistrict (nahiya) of the Mhardeh District in Hama.

The center of this subdistrict is Karnaz.

According to the Syria Central Bureau of Statistics (CBS), the Karnaz Subdistrict had a population of 25,039 in the 2004 census.

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