Abstract The international solidarity movement for the East Timorese was developed in Southeast Asian nations during the 1990s as ‘the issue of East Timor’ became a primary concern for the ASEAN countries’ civil society. Proponents of liberal democracy have assumed that international solidarity movements for human rights and democracy during the 1990s resulted from the powerful momentum of liberal democracy that universally linked foreign people. However, Michael Hardt, Antonio Negri and their marxist followers have explained these transnational movements as a transnational network that overcomes national borders against the capitalist Empire. Nevertheless, the political history of transnational solidarity movements from East Timor to Southeast Asia in the post-Cold War 1990s makes clear that nationalism has continued to be an ideological driver to link people from different nations. Focusing on the international solidarity for the East Timorese independence struggle, this paper demonstrates a transnational function of nationalism through which international solidarity movements are created, resonate and function. The East Timor international solidarity struggle successfully created a transnational platform through the APCET conferences held in the Philippines, Malaysia and Thailand in the 1990s. Socio-historical analysis of APCET reveals that nationalists in Southeast Asia shared collective memories of national struggles beyond their spaces and times to create a transnational force to support self-determination for the East Timorese. Through its analysis, this article extends the theoretical framework of nationalism that has explained nationalist movements to serve as a more powerful tool to explain international solidarity in the age of globalisation. (247 words)