Cheshmeh Langan Rural District (Persian: دهستان چشمه لنگان) is in the Central District of Fereydunshahr County, Isfahan province, Iran. Its capital is the village of Sibak.

At the National Census of 2006, its population was 3,031 in 705 households. There were 2,710 inhabitants in 800 households at the following census of 2011. At the most recent census of 2016, the population of the rural district was 2,495 in 774 households. The most populous of its 25 villages was Sibak, with 1,290 people.