Princess Piyamavadi Sri Bajarindra Mata (Thai: สมเด็จพระปิยมาวดี ศรีพัชรินทรมาตา; RTGS: Piyamawadi Siphatcharin Mata) or Chao Khun Chom Manda Piam (Thai: เจ้าคุณจอมมารดาเปี่ยม) née Piam Sucharitakul (Thai: เปี่ยม สุจริตกุล; RTGS: Piam Sucharitakun) was one of the royal wives of King Mongkut. All three of her daughters became queens.

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Piyamavadi
Princess Queen's Mother of Siam
Born	(1838-03-05)5 March 1838 Siam
Died	3 April 1904(1904-04-03) (aged 66) Bangkok, Siam
Spouse	Mongkut (Rama IV)
Issue	Prince Unakan Ananta Norajaya Prince Devawongse Varopakarn Queen Sunandha Kumariratana Queen Savang Vadhana Queen Saovabha Phongsri Prince Svasti Sobhana
House	Chakri Dynasty
Father	Lord Asa Samdaeng (Taeng Suchritakul)
Mother	Dame Sucharitthamrong (Nag Sucharitakul)

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Her father was the original caretaker of King Mongkut while he ordained, and he passed in the first year of the reign of King Mongkut. Thus H.M. the King patronized his family, bestowed the title Thao (Dame) to his wife, gave her the duties, and sponsored his children.

When her grandson, Crown Prince Maha Vajiravudh (Rama VI) acceded to the throne to be King Vajiravudh, he promoted her as Princess Piyamavadi Sri Bajarindra Mata (meaning: Piam, Princess Mother of Queen Sri Bajarindra).

She had six children with King Mongkut:

1. Prince Unakan Ananta Norajaya
2. Prince Devan Uthayawongse (Later Prince Devavongse Varoprakarn)
3. Princess Sunandha Kumariratana (Later Queen Sunandha Kumariratana)
4. Princess Savang Vadhana (Later Queen Sri Savarindira, the Queen Grandmother)
5. Princess Saovabha Bongsi (Later Queen Sri Bajarindra, the Queen Mother)
6. Prince Svasti Sobhana (Later Prince Svastivatana Visishta)