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The South-East Asian League (東南アジア同盟 Tōnan'ajia Dōmei, lit. The League of South-East Asian Nations) is one of the new nations in the Mahouka Koukou No Rettousei universe created following World War III.
The South-East Asian League is made up of territories consisting of modern day Indonesia, Singapore, Philippines, Malaysia, Brunei, Cambodia, East Timor, New Guinea, Taiwan, and the Kingdom of Thailand. 
- The South-East Asian League mediated between the Great Asian Union and Japan, after being requested in order for a ceasefire to be established after the events of Scorched Halloween.