Mazraeh Now Rural District (Persian: دهستان مزرعه نو) is in the Central District of Ashtian County, Markazi province, Iran. Its capital is the village of Mazraeh Now.

At the National Census of 2006, its population was 3,853 in 1,112 households. There were 3,382 inhabitants in 1,099 households at the following census of 2011. At the most recent census of 2016, the population of the rural district was 3,142 in 1,113 households. The most populous of its 14 villages was Kardijan, with 1,635 people.