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Thailand is a unitary constitutional monarchy with a parliamentary form of government. In the Economist Democracy Index 2024, it received an overall score of 6.27/10 ("hybrid regime") and a rating of 6.5/10 for electoral processes and pluralism.
On the national level, the lower house of parliament, the House of Representatives is elected directly.
House of Representatives
House of Representatives
In general parliamentary elections, only the House of Representatives is elected, which usually takes place every 4 years. Voting is not compulsory, and the minimum age of suffrage is 18 years.
The 500 members of the House of Representatives are elected in a parallel voting system:
400 representatives are elected in single-seat constituencies via a single-round, choose-one plurality voting.e. first-preference plurality (FPP) or first-past-the-post (FPTP).
100 representatives are elected in a single national (multi-seat) constituency via a closed-list proportional representation system, using the simple quota (Hare quota) and largest remainder method. This system thus provides "mixed majoritarian" (mixed non-proportional) representation, with individual districts dominating the outcome. There is no legal electoral threshold.
Notes
Notes
This is the description of the electoral system of Thailand as of 29.07.2026 on Electoral Knowledgebase. Sources and further information on this topic:
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