The Belgian Anti-Slavery Society (French: Société antiesclavagiste de Belgique, Dutch: Antislavernijmaatschappij van België) was a 19th-century organization, with the goal of putting an end to the Arab slave trade in the African continent.
The founders were inspired by the preaching of Charles Lavigerie, a French Cardinal, held at the Cathedral of St. Michael and St. Gudula in August 1888.
From 1890 to 1899 the Société antiesclavagiste de Belgique organized and funded four military expeditions, sent to fight the Arab/Zanzibari slavers of the eastern Congo Free State regions.
The Belgian Anti-Slavery Society published the journal Le mouvement antiesclavagiste (redaction by Louis Delmer), in 1899 it merged with the Oeuvre des Missions Catholiques au Congo.
They also organized a follow-up conference at the Academy Palace to put pressure on the countries that had rejected the anti-slavery act thus far, mainly the Netherlands and the Ottoman Empire.