Queen Debsirindra of Siam (Thai: เทพศิรินทร; rtgs: Thepsirin), formerly Queen Ramphoei Phamaraphirom (Thai: รำเพยภมราภิรมย์), born Princess Ramphoei Siriwong (Thai: รำเพย ศิริวงศ์; 17 July 1834 – 9 September 1861) was the second consort of King Mongkut, and mother of King Chulalongkorn.
Princess Ramphoei was born in 1834 to Prince Siriwongse, the Prince Matayaphithak (son of Rama III and Concubine Sap) and Lady Noi (Mom Noi). She was of Mon descent. When her father died at only 27 years, her grandfather—the king—took her and her sister Pannarai to the Grand Palace and they were said to be his favourite grandchildren. In 1853, Ramphoei married her great-uncle Mongkut (who was 30 years her senior) and was raised to a Phra Ong Chao (a higher rank of princess). In the same year she gave birth to Prince Chulalongkorn. She later became Queen Ramphoei.
She had 4 children with King Mongkut.
Prince Chulalongkorn (จุฬาลงกรณ์), later King Chulalongkorn (1853–1910)
Princess Chandramandala / Chanthonmonthon (จันทรมณฑล), later the Princess Wisutkrasat (1855–1863)
Prince Chaturonrasmi / Chaturon Ratsami (จาตุรนต์รัศมี), later the Prince Chakrabardibongse (1856–1900)
Queen Ramphoei died in 1861. Her sister (who was also Mongkut's wife), Princess Pannarai, acted as Mongkut's consort for the remainder of his reign. When Chulalongkorn was crowned in 1867, she was posthumously given the title Debsirindramataya, the Queen Mother. Her grandson, Vajiravudh (Rama VI), gave her the name Queen Debsirindra.