Darkhan-Uul (Mongolian: Дархан-Уул, literally Blacksmith Mountain) is one of the 21 aimags (provinces) of Mongolia. It is located in the northern part of the country.

The city Darkhan was founded on October 17, 1961, as a second industrial center to reduce migration pressure on the capital, Ulaanbaatar. To achieve this, the existing sum (district) of the same name was dissolved, and its territory managed by the city authorities.

The Darkhan-Uul aimag, comprising four sums, was carved out of the Selenge aimag in 1994.

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Darkhan is the point where the side line to Erdenet forks off the main line of the Trans-Mongolian Railway.

Darkhan Uul Aimag is situated in the agricultural heartland of Mongolia and is a major agricultural producer in the country, with rich resources for agricultural development. Located at a low altitude, this area has a warmer climate than the rest of the country. The Kharaa River basin offers favorable natural climatic conditions for the cultivation of cereals, vegetables, and especially potatoes. There are 35 agricultural companies and co-operatives in Darkhan Uul Aimag. This area comprises 30,000 hectares of soil suitable for arable farming and 1287.8 thousand hectares for vegetable farming. Despite the development of the urban economy, local people continue to engage in livestock herding, with approximately 130,000 head of livestock in the province.

The sums of Darkhan-Uul Aimag

Sum	Mongolian	Population (2002)	Population (2004)	Population (2006)	Population (2008)	Population (2009)	Area (km)	Density (/km)
Darkhan*	Дархан	70,029	74,275	73,457	75,104	74,454	103	722.85
Khongor	Хонгор	5,628	5,390	5,404	5,115	5,603	2,533	2.21
Orkhon	Орхон	3,435	2,913	2,932	3,076	3,185	478	6.66
Sharyngol*	Шарынгол	8,376	7,848	7,634	7,798	8,116	160.6	50.54

- urban settlement