Wang Nam Yen (Thai: วังน้ำเย็น, pronounced [wāŋ ná(ː)m jēn]) is a district (amphoe) in the southern part of Sa Kaeo province, eastern Thailand.

They named the new village Ban Wang Nam Yen after their important water resource.

It was upgraded to Tambon Wang Nam Yen of Sa Kaeo district in 1975.

[1] Wang Nam Yen was upgraded to a full district on 1 April 1983.

[2] Neighboring districts are (from the north clockwise) Khao Chakan, Watthana Nakhon, Khlong Hat, and Wang Sombun of Sa Kaeo province and Tha Takiap of Chachoengsao province.