Wiang Nong Long (Thai: เวียงหนองล่อง, pronounced [wīa̯ŋ nɔ̌ːŋ lɔ̂ŋ]) is a district (amphoe) of Lamphun province, northern Thailand.

[2] With publication in the Royal Gazette on 24 August, the upgrade became official.

[3] Neighboring districts are (from the east clockwise) Pa Sang and Ban Hong of Lamphun Province, Chom Thong and Doi Lo of Chiang Mai province.

The district Wiang Nong Long is divided into three sub-districts (tambon), which are further subdivided into 25 administrative villages (Muban).

There are three sub-district municipalities (Thesaban Tambon) in the district: