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 Portrait at Wat Chana Songkhram | |
| Viceroy of Siam | |
| Tenure | 1782 – 3 November 1803 |
| Appointer | Phutthayotfachulalok (Rama I) |
| Predecessor | Inthraphithak (as Viceroy of Thonburi) |
| Successor | Itsarasunthon (later Rama II) |
| Deputy Viceroy | Anurak Devesh |
| Born | 1 November 1744 Ayutthaya, Ayutthaya |
| Died | 3 November 1803 (aged 59) Bangkok, Siam |
| Spouse |
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| Issue | 43 sons and daughters |
| House | Chakri dynasty |
| Father | Thongdi (later Somdet Phra Pathom Borom Maha Chanok) |
| Mother | Daoreung (Yok; later Phra Akkhara Chaya) |
| Religion | Theravada Buddhism |
Maharurasinghanat, Prince of Front Palace (Thai: สมเด็จพระบวรราชเจ้ามหาสุรสิงหนาท; RTGS: Somdet Phra Boworaratchao Mahasurasinghanat (1 November 1744 – 3 November 1803) was the younger brother of King Rama I, the first monarch of the Chakri dynasty of Siam. As an Ayutthayan general, he fought alongside his brother in various campaigns against Burmese invaders and the local warlords. When his brother crowned himself as the king of Siam at Bangkok in 1781, he was appointed the Front Palace or Maha Uparaj, the title of the heir. During the reign of his brother, he was known for his important role in the campaigns against Bodawpaya of Burma.