Sìn HỠis a rural district of Lai Châu province in the Northwest region of Vietnam. There are various ethnic minorities of people such as the Mong and Dao.
As of 2019, the district had a population of 83,643. The district covers an area of 1,526.96 km<sup>2</sup>. The district capital lies at Sìn Há»Â.
The district is subdivided to 22 commune-level subdivisions, including Sìn Há» township and the rural communes of CÃÂn Co, ChÃÂn Nða, Há»Âng Thu, Làng Mô, Lùng Thàng, Ma Quai, NáºÂm Cha, NáºÂm Cuá»Âi, NáºÂm HÃÂn, NáºÂm Mạ, NáºÂm TÃÂm, Noong Hẻo, Pa Khóa, Pa Tần, PhÃÂng Sô Lin, Phìn Há»Â, Pu Sam Cáp, SàDá» Phìn, Tả Ngảo, Tả Phìn and Tá»§a SÃÂn Chải.