Maha Thammaracha (Thai: มหาธรรมราชา, pronounced [mā.hǎː tʰām.mā.rāː.t͡ɕʰāː]; Pali: Mahā Dhammarājā; Sanskrit: Mahā Dharmarājā; literally "Great Dharmic King"), or the extended version Maha Thammarachathirat (Thai: มหาธรรมราชาธิราช, IPA: [má.hǎ: tʰam.má.raː.t͡ɕʰaː.tʰí.râ:t]; Pali: Mahā Dhammarājādhirāja; Sanskrit: Mahā Dharmarājādhirāja; "Great Dharmic King of High Kings"), was a Thai exalted title given to the Buddha. The title was also occupied by monarchs of Sukhothai, an ancient kingdom in Thailand, and may refer:
- Maha Thammaracha I, also known as Li Thai
- Maha Thammaracha II
- Maha Thammaracha III, also known as Sai Lue Thai
- Maha Thammaracha IV, also known as Ban Mueang
- Maha Thammaracha (king of Ayutthaya)