Timor-Leste became a member state of the Association of Southeast Asian Nations on 26 October 2025 during the 47th ASEAN Summit, finishing a two-decade accession process.
The island nation was recognised as an observer to ASEAN soon after it gained independence in May 2002. By 2007, all of its political parties supported closer ties with the organisation, and leaders declared a "strategic decision" to seek membership. The country applied for membership in 2011, and ASEAN agreed in principle to admit the country and make it a formal observer in 2022.
Timor-Leste has the smallest GDP in the ASEAN by far. Its GDP is less than 15% of Laos, the member state with the second-smallest GDP.
Accession requirements
The ASEAN Charter defines the following criteria for membership:
The state must be geographically located in Southeast Asia. The state must be recognised by all ASEAN member states. The state must agree to be bound by the ASEAN Charter The state must be able and willing to carry out the obligations of membership such as: Maintaining embassies in all current member countries of the blocAquino to back East Timor's bid for ASEAN membership Retrieved 14 May 2011 Attending all ministerial meetings and summits Acceding to all treaties, declarations and agreements in the blocPreparations for the Membership of ASEAN Retrieved 14 May 2011
Timor-Leste membership issues To become a member of ASEAN, Timor-Leste needed to fully meet the organisation's conditions and obligations, which include the ability to meet the requirements for participation in the three main pillars of political-security (APSC), economic (AEC), and socio-cultural (ASCC). While there are no membership requirements pertaining to a country's level of development, some countries had historically opposed Timor-Leste's accession due to its underdeveloped economy. Indonesia, Malaysia, Brunei, Thailand, Cambodia, the Philippines and Myanmar supported Timor-Leste in its desire for full membership, but concerns were expressed behind closed doors that ASEAN already had enough problems with Myanmar. Singapore in particular was skeptical as to whether Timor-Leste would be able to cope with accession, objections that were finally overcome in 2025.
Timor-Leste is one of the poorest countries in Asia, facing many challenges including maintaining security, economic development, efforts to combat corruption in the national budget, and being heavily dependent on oil exports, which account for up to 80–90% of its revenue. Additionally, improving healthcare and education systems is a priority. The country's infrastructure is also relatively underdeveloped, and the literacy rate is approximately 72% as of 2022. According to the World Bank's data, in 2012, Timor-Leste had a population of 1.2 million people and a GDP of US$1.29 billion, which is only 15% of the smallest economy within ASEAN, which is Laos with a GDP of US$9.2 billion. Thus fast tracking Timor-Leste's accession to ASEAN was seen as too hasty at the time.
By 2015, Timor-Leste had fulfilled three major requirements: the country was located in Southeast Asia, was recognised by all ASEAN member states, and has opened embassies in all ASEAN member countries.
The 2023 roadmap to membership included a number of steps Timor-Leste needs to fulfil, including the capacity to host large meetings and sufficient English-speaking government staff.
Timeline of relations with ASEAN Date Event 20 May 2002 Timor-Leste gains its independence from Indonesia and is recognised as an ASEAN observer. 26 July 2005 After a case-by-case review and a delay in Pakistan's admission to the ASEAN Regional Forum due to India's disagreement, Timor-Leste joins the ASEAN Regional Forum, during the Twelfth Meeting of the ARF in Vientiane, Laos. 13 January 2007Timor-Leste accedes to the Treaty of Amity and Cooperation in Southeast Asia. 4 March 2011 Timor-Leste officially applies for membership in ASEAN. 6 July 2019 ASEAN fact-finding mission on Timor-Leste is formed. This fact-finding mission investigates the eligibility and readiness of Timor-Leste to join the ASEAN Community. This consists of three pillars: the ASEAN Political-Security Community (APSC), the ASEAN Economic Community (AEC) and the ASEAN Socio-Cultural Community (ASCC). 22 July 2019 Timor-Leste sends delegations to the ASEAN Secretariat Technical Meeting. A delegation of 20, the largest ever delegation of East Timorese Government officials to visit the ASEAN Secretariat prior to Timor-Leste's joining, led and coordinated by the Directorate-General for ASEAN Affairs in the Ministry of Foreign Affairs and Cooperation. The delegation is composed of Director-Generals and Focal Points from line ministries working towards ASEAN accession across all the three pillars. This covers various important issues, which include learning about the ASEAN institutional framework and organic structure, decision-making bodies and processes, legal instruments and agreements, and technical cooperation. 3 September 2019 APSC Screening of Timor-Leste starts. 6 July 2022 ASCC Screening of Timor-Leste starts. 19 July 2022 AEC Screening of Timor-Leste starts. During the three-day AEC Fact-Finding Mission, delegates met with key Timor-Leste ministries/government agencies involved in the country's accession to the ASEAN Economic Agreements, including the Ministry of Finance, the Ministry of Petroleum and Minerals, the Ministry of Tourism, Trade and Industry, the Ministry of Agriculture and Fisheries, the Ministry of Public Works, the Ministry of Transport and Communication, the Customs Authority, and the Secretariat of State for Professional Training and Labor (SoSPTE). There were also meetings with Timor-Leste's Chambers of Commerce and Industry, as well as the business community. 11 November 2022 ASEAN agrees "in principle" to admit Timor-Leste; the country gains observer status at all high-level ASEAN meetings. 11 May 2023ASEAN members finalise a dedicated road map for Timor-Leste to facilitate its full membership in the bloc. The roadmap requires Timor-Leste to align its laws and institutions with all three ASEAN pillars (APSC, AEC, and ASCC), improve human resources with strong English capacity to participate in ASEAN meetings, and upgrade basic infrastructure like airports, ports, roads, telecommunications, and hotels. It also includes readiness to contribute financially to ASEAN and to host and coordinate ASEAN activities. 25 October 2025 Timor-Leste deposited its instruments of accession to ASEAN, and accedes to the Southeast Asian Nuclear-Weapon-Free Zone Treaty. 26 October 2025 Timor-Leste is elevated to an ASEAN member state with signing of the Declaration on the Admission of Timor-Leste into ASEAN.
Foreign relations with ASEAN member states
Thailand (20 May 2002) Brunei (20 May 2002) Malaysia (20 May 2002) Philippines (20 May 2002) Singapore (20 May 2002) Indonesia (2 July 2002) Vietnam (28 July 2002) Cambodia (29 July 2002) Laos (29 July 2002) Myanmar (26 September 2006)
Observer state
Papua New Guinea (22 July 2002)
History
Early relations In 2002, Timor-Leste was recognised as an observer of ASEAN and joined the ASEAN Regional Forum in 2005. After being admitted to the ASEAN Regional Forum (ARF) in July 2005, the application to join ASEAN was submitted in Kuala Lumpur on 28 July 2006. In preparation for accession, the country acceded to the Treaty of Amity and Cooperation in Southeast Asia in January 2007, pledging to renounce the use of force and binding Timor-Leste to non-interference in the internal affairs of ASEAN member states. In August 2007, the ASEAN states declared their willingness in principle to admit Timor-Leste.
In 2005, Timor-Leste said it wanted to be a member by 2010. In December 2007 President José Ramos-Horta restated that joining was a top priority, and he hoped to join by 2012. In January 2009, Thai Prime Minister Abhisit Vejjajiva said that his country would support Timor-Leste's membership of ASEAN by 2012.
In 2010, Timor-Leste attended the ASEAN summits as a "special guest of the presidency".
Accession delays Timor-Leste officially applied for membership in ASEAN on 4 March 2011."Timor Leste Hopes Enter ASEAN Next Year", idrpress.com. 9 December 2010 As months passed, Prime Minister Xanana Gusmão put the brakes on hopes over joining ASEAN in 2011, stating that the country still lacked the necessary "human resources". After elections in 2012, the new government reaffirmed their commitment to joining the association. While Indonesia, which Timor-Leste gained their independence from in 2002, has pushed for them to be granted ASEAN membership, other countries, such as Singapore and Laos, have objected on the grounds that Timor-Leste is not yet developed enough to join. However, after the ASEAN summit in April 2013, Secretary General of ASEAN Lê Lương Minh stated that all member states supported Timor-Leste's admission to the association, although he also said that the country was not yet qualified for membership. Philippine President Benigno Aquino III pledged his country's support to Timor-Leste's ASEAN membership in June 2013. The Philippines has previously supported Timor-Leste's ASEAN membership through official documents in 2002 and 2010.
By September 2013, the ASEAN's Coordinating Council Working Group was still evaluating Timor-Leste's membership application, and Minh said that there was no timeline for when the assessment would be completed. Singapore pledged that it would not block Timor-Leste's membership in the association but did not explicitly support it, stating that plans for economic integration must not be derailed by the country's accession. In November 2013, U Aung Htoo, ASEAN Affairs Department deputy director, said that Timor-Leste would not be ready to join in 2014 since they do not have an embassy in all 10 current ASEAN member states, a necessity for membership.
In 2015, Timor-Leste said it is now ready to join the association at any time, telling via Timor-Leste's ambassador to Malaysia that their country had at least fulfilled two major requirements for ASEAN membership. The Philippines re-echoed its support for Timor-Leste's accession to ASEAN on the same year.
In 2017, the Philippines, a close ally of Timor-Leste, became the ASEAN host for 2017. However, ASEAN bypassed Timor-Leste's membership in 2017, mostly because of its lack of human resources which was pointed out by Singapore. Despite this, it was announced that Timor-Leste Prime Minister Mari Alkatiri will continue Timor-Leste's participation in ASEAN as an observer during the 2017 summit. The Philippines, Indonesia, Thailand, and Cambodia reiterated Timor-Leste's membership application during the summit, but 6 member states led by Singapore did not support the move.
In 2018, Timor-Leste's application for membership was still being studied by the association. Despite Singapore being historically opposed to Timor-Leste's accession to the association due to economic reasons, the country began to openly state that they are welcoming the country's membership application when the Timorese Prime Minister visited the latter.
On 2 July 2025, Myanmar officially notified Malaysia, the 2025 ASEAN chair, of its opposition to Timor-Leste joining the bloc in October 2025, citing interference in its internal affairs. Timor-Leste has reportedly supported the opposing democratic forces in the ongoing civil war. Timor-Leste rejected the criticisms and stated it had fulfilled all membership requirements.
Fact-finding mission In 2019, ASEAN formed a fact-finding mission to visit the country in September to determine its readiness in joining the association. In June 2019, several ASEAN ministers reiterated their support for Timor-Leste's membership bid.