Thạnh Phú is a rural district located in the Bến Tre province within the Mekong Delta region of Vietnam. The district serves as a primary administrative area, with its namesake town of Thạnh Phú serving as the district capital.
The district covers a total land area of 401 km² (approximately 155 sq mi). As of 2019, the population of the region was recorded at 127,841 residents.