Tân Thạnh was a rural district (huyện) of Long An province in the Mekong Delta region of Vietnam.
As of 2003 the district had a population of 78,970. The district covers an area of . The district capital lies at Tân Thạnh township.
On June 16, 2025, the Standing Committee of the National Assembly issued Resolution No. 1685/NQ-UBTVQH15. The district was dissolved and new wards were rearranged from the district.
Divisions The district is divided into one urban municipality and 12 communes:
Tân Thạnh township, Bắc Hòa, Hậu Thạnh Đông, Hậu Thạnh Tây, Kiến Bình, Nhơn Hòa, Nhơn Hòa Lập, Nhơn Ninh, Tân Bình, Tân Hòa, Tân Lập and Tân Ninh.
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