Thai order of precedence

Royal Family

King Chulalongkorn described the order of precedence in his literature "Traditional of Royal Family of Siam". ^[1]

Gentlemen

1. The Sovereign
2. The Viceroy (Grand Commander)
3. The Viceroy (Commander)
4. The Deputy Viceroy
5. Sons of the Former Sovereign and Queen
   1. Great Uncles of the Sovereign
   2. Uncles of the Sovereign
   3. Brothers of the Sovereign
6. Sons of the Sovereign and Queen
7. Sons of the Former Sovereign and Royal Consort
   1. Great Uncles of the Sovereign
   2. Uncles of the Sovereign
   3. Brothers of the Sovereign
8. Sons of the Sovereign and Royal Consort
9. Sons of the Former Sovereign and Royal Concubine
   1. Great Uncle of the Sovereign
   2. Uncles of the Sovereign
   3. Brothers of the Sovereign
10. Sons of the Sovereign and Royal Concubine
11. Nephews of the Sovereign
12. Grandsons of the Sovereign who are sons of son of the Sovereign and daughter of the Sovereign
13. Sons of the Viceroy and Royal Consort
14. Sons of the Former Viceroy
15. Sons of the Viceroy
16. Grandsons of the Sovereign who are sons of son of the Sovereign and Queen or Royal Consort and Princess
17. Grandsons of the Sovereign who are sons of son of the Sovereign and Royal Concubine and Princess
18. Sons of Prince Matayabitak, the Prince Maternal Grandfather of Rama V
19. Sons of the Deputy Viceroy and Royal Consort
20. Grandsons of the Sovereign who are sons of son of Sovereign and the commoner
21. Royal Great Grandsons of the Sovereign

Ladies

1. Queen Mother
2. The Sovereign's Consort (Queen)
3. Queen Dowager
4. Royal Consort
5. Daughters of the Former Sovereign and Queen
   1. Great Aunts of the Sovereign
   2. Aunts of the Sovereign
   3. Sisters of the Sovereign
6. Daughters of the Sovereign and Queen
7. Daughters of the Former Sovereign and Royal Consort
   1. Great Aunts of the Sovereign
   2. Aunts of the Sovereign
   3. Sisters of the Sovereign
8. Daughters of the Sovereign and Royal Consort
9. Daughters of the Former Sovereign and Royal Concubine
   1. Great Aunts of the Sovereign
   2. Aunts of the Sovereign
   3. Sisters of the Sovereign
10. Daughters of the Sovereign and Royal Concubine
11. Nieces of the Sovereign
12. Royal Consort who are granddaughters of the Sovereign
13. Granddaughters of the Sovereign who are daughters of son of the Sovereign and daughter of the Sovereign
14. Daughters of the Viceroy and Royal Consort
15. Daughters of the Former Viceroy
16. Daughters of the Viceroy
17. Granddaughters of the Sovereign who are daughters of son of the Sovereign and Queen or Royal Consort and Princess
18. Granddaughters of the Sovereign who are sons of daughters of the Sovereign and Royal Concubine and Princess
19. Daughters of Prince Matayabitak, the Prince Maternal Grandfather of Rama V
20. Daughters of the Deputy Viceroy and Royal Consort
21. Granddaughters of the Sovereign who are daughters of son of Sovereign and the commoner
22. Royal Great Granddaughters of the Sovereign

Current Order of Precedence

Order	Name	Note
1	HM The King
2	HM The Queen
3	HRH The Princess Debaratanarajasuda
4	HRH The Princess Srisavangavadhana
5	Princess Ubolratana Rajakanya	In spite of relinquishing all noble titles, she is included in the order because she is the daughter of the former King and oldest sister of the current King
6	HRH The Princess Suddhanarinatha	Bestowed the honor on a special case
7	HRH The Princess Rajasarini Siribajra
8	HRH Princess Sirivannavari
9	HRH Prince Dipangkorn Rasmijoti
10	HRH Princess Siribha Chudabhorn
11	HRH Princess Aditayadorn Kitikhun
12	HH Prince Chalermsuk Yugala
13	Thanphuying Ploypailin Jensen	She is granddaughter of the former King, graciously accepted to be ranked higher than a prince who is the title Serene Highness is a special case.
14	Thanphuying Sirikitiya Jensen	She is granddaughter of the former King, graciously accepted to be ranked higher than a prince who is the title Serene Highness is a special case.
15	Thanphuying Dhasanawalaya Sornsongkram	Graciously accepted to be ranked higher than a prince who is the title Serene Highness is a special case.
16	Capt. Jitat Sornsongkram	Graciously accepted to be ranked higher than a prince who is the title Serene Highness is a special case.
17	HSH Prince Charunritdet Jayankura
18	HSH Princess Uthaikanya Bhanubandhu
19	HSH Prince Nawaphan Yugala
20	HSH Prince Thikhamphon Yugala
21	HSH Prince Chatrichalerm Yugala
22	HSH Prince Chulcherm Yugala
23	HSH Princess Nopphadonchaloemsi Yugala
24	Miss Induratana Paribatra
25	Mr Juthavachara Vivacharawongse
26	Mr Vacharaesorn Vivacharawongse
27	Mr Chakriwat Vivacharawongse
28	Mr Vatchrawee Vivacharawongse
29	Khunying Wutchaloem Vudhijaya
30	Mrs Phanwarophat Svetarundra
31	Mrs Phanuma Phiphitphokha
32	Mrs Sisawangwong Bunyachittradun
33	Mrs Phummariphirom Shell
34	Mrs Patthamanarangsi Senanarong

References

1. Chulalongkorn (2017-10-19). "ธรรมเนียมราชตระกูลในกรุงสยาม". vajirayana.org. Retrieved 2020-01-27.