Ý Yên [i˧˥:iən˧˧] is a rural district of Nam Định province in the Red River Delta region of Vietnam.

As of 2003 the district had a population of 241,689.

[1] The district covers an area of 240 km².

The district capital lies at Lâm.

This article about a location in Nam Định Province, Vietnam is a stub.