Which one of the following countries is not a member of ASEAN?

Bangladesh is not a member of the Association of Southeast Asian Nations (ASEAN). ASEAN was founded in 1967 by Indonesia, Malaysia, the Philippines, Singapore and Thailand and later expanded to a ten‑member grouping when Brunei Darussalam, Vietnam, Lao PDR, Myanmar and Cambodia joined, bringing its membership to ten states [1]. Official ASEAN listings and historical records confirm the current ten member states as Brunei, Cambodia, Indonesia, Lao PDR, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Viet Nam, with no mention of Bangladesh among them [2]. Therefore, among the given options, Bangladesh is the non‑member of ASEAN.

Sources

1. [1] Contemporary World Politics, Textbook in political science for Class XII (NCERT 2025 ed.) > Chapter 2: Contemporary Centres of Power > 20 Contemporary World Politics > p. 20
2. [2] https://asean.org/about-asean/