Arboretum d’Antsokay or Antsokay Arboretum is a botanical garden near the city of Toliara in Madagascar. About 900 plant species grow in the Arboretum, 90% of these endemic to Madagascar, 80% of them considered to have medicinal value and many threatened with extinction. Lonely Planet and Rough Guides both list the Arboretum as the top attraction in Toliara.

The Arboretum is located just off the RN7, about 12km southeast of the city, and only 6km from Toliara airport. It is open 7.30-17.30 and closed during the month of February.

There is an interpretation centre, a small museum (with rocks, fossils and an Aepyornis egg), a display of musical instruments and local crafts, a shop, a restaurant, as well as accommodation for visitors at Auberge de la Table. Guided tours are available in English.

Arboretum d’Antsokay collaborates on conservation projects with Royal Botanic Gardens Kew, the WWF, and the CEPF.