Mueang Nan (, ) is the capital district (amphoe mueang) of Nan province, northern Thailand.
The district was Khwaeng Nakhon Nan, set up in 1899 by the Ministry of Interior. It was renamed Mueang Nan District in 1917. Khun Yommana Nattikan was the first district officer.
Neighboring districts are from the north clockwise Tha Wang Pha, Santi Suk, Phu Phiang, Wiang Sa, Ban Luang of Nan Province and Pong of Phayao province.
Mueang Nan District comprises 7 sub-district administrative organizations (tambons): Tambon Bo, Tambon Thum Tong, Tambon Rueang, Tambon Na Saw, Tambon Bo Suak, Tambon Sa Nian, and Tambon Pha Sing (outside the Mueang Nan Municipality); 2 sub-district municipalities (thesaban tambon): Tambon Du Tai and Tambon Kong Khwai; and 2 city municipalities (thesaban mueang): Mueang Nan Municipality (Tambon Nai Wiang + Tambon Pha Sing) and Mueang Chaiyathan Municipality. Mueang Nan District has a total of 137 communities and villages (mubans).
Mueang Nan District is divided into 11 sub-districts and has a total of 137 communities or villages, as follows:
<small>Missing numbers are tambon which now form Phu Phiang District.</small>