Hậu Lộc is a district (huyện) of Thanh Hóa Province in the North Central Coast region of Vietnam. As of 2003 the district had a population of 183,852. The district covers an area of 141km². The district capital lies at Hậu Lộc.
The village of Phú Điền, in xã Triệu Lộc is the site of the Bà Triệu Temple.