Zamboanga del Sur (Cebuano: Habagatang Zamboanga; Chavacano:Provincia de Zamboanga del Sur; Subanen: S'helatan Sembwangan/Sembwangan dapit Shelatan) is a province in the Philippines located in the Zamboanga Peninsula region in Mindanao. Its capital is the city of Pagadian. Grouped with Zamboanga del Sur is the highly urbanized city of Zamboanga, which is governed independently from the province.

The province borders Zamboanga del Norte to the north, Zamboanga Sibugay to the west, Misamis Occidental to the northeast, and Lanao del Norte to the east. To the south is the Moro Gulf.

The name of Zamboanga is the Hispanicized spelling of the Sinama term for "mooring place" - samboangan (also spelled sambuangan; and in Subanen, sembwangan), from the root word samboang ("mooring pole"). "Samboangan" was the original name of Zamboanga City, from where the name of the peninsula is derived from. "Samboangan" is well-attested in Spanish, British, French, German, and American historical records from as far back as the 17th century.

This is commonly contested by folk etymologies which instead attribute the name of Zamboanga to the Indonesian word jambangan (claimed to mean "place of flowers", but actually means "pot" or "bowl"), usually with claims that all ethnic groups in Zamboanga were "Malays". However, this name has never been attested in any historical records prior to the 1960s.

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