Thailand was previously known as Siam.
The Anglo-Siamese Treaty of 1909 provided rights for British subjects in Siam, including the right of property the right of residence and travel. As part of this treaty, the Siamese government transferred to the British government the states of Kelantan, Tringganu, Kedah, Perlis, and adjacent islands. These areas areas became part of the Unfederated Malay States.
A rubber plantation industry developed in Thailand. For general information about this industry, see Malaysia.
There was a Norwegian community in Thailand. 
- See General Register Office for general sources which may be relevant.
- British Association for Cemeteries in South Asia (BACSA) has published
- Bangkok : the Protestant Cemetery, & notes on other cemeteries in Thailand by Justin Corfield. 1997
- BACSA have put indexes to the majority of their cemetery books online, including it is believed this book, and these indexes are free to browse. For more details, see the Fibiwiki page British Association for Cemeteries in South Asia.
- The FamilySearch catalogue of microfilms/digitised microfilms includes the following
- "Extracts from St. Andrew's Outlook, quarterly messenger of the Presbyterian Churches in Malaya, Sumatra, Burma and Siam : marriages and deaths, March 1914 - July 1951" catalogue entry film 87992. See the Fibiwiki page FamilySearch Centres for information about microfilms and digitized microfilms.
- For online editions of the publication The Directory & Chronicle for China, Japan, Corea, Indo-China, Straits Settlements, Malay States, Siam, Netherlands India, Borneo, the Philippines, &c, and similar publications, which may contain birth, marriage and death notices, see the Fibiwiki page China.
- Some incidental records relating to Siam, especially BMDs for the 19th century, may have been collected by the Anglo-Burmese Library. Refer Burma - External links
- Bangkok Protestant Cemetery bangkokcemetery.org. Site currently under construction.
- Bangkok Protestant Cemetery findagrave.com.
- "The Protestant Cemetery Bangkok: a memorial to the early pioneers" by Eric Lim. Some members of the Jewish community in Bangkok were also buried there.
- British, German and Danish graves are the most common.
- First World War: The Siam Expeditionary Force
- Why did Siam join the First World War? by Pad Kumlertsakul 2 August 2017. Blog from The National Archives, England.
- "The Inscriptions On The First World War Volunteers Memorial, Bangkok" by Brendan and Suthida Whyte. Journal of the Siam Society 2008 Vol. 96 page 175-192. siamese-heritage.org
- Bangkok, Town Plan (North), Bangkok, Town Plan (South) 1945. War Office maps, British Library Online Gallery.
Historical books online
- "Early Trade Relations between Denmark and Siam" by His Highness Prince Dhani Nivat and Major Erik Seidenfaden page 1 The Journal Of The Siam Society 1939 Vol XXXI Archive.org.
- The history of Japan, giving an account of the ancient and present state and government of that empire : of its temples, palaces, castles and other buildings, of its metals, minerals, trees, plants, animals, birds and fishes, of the chronology and succession of the emperors, ecclesiastical and secular, of the original descent, religions, customs, and manufactures of the natives, and of their trade and commerce with the Dutch and Chinese : together with a description of the kingdom of Siam by Engelbert Kaempfer [1651-1716], translated by John Gaspar Scheuchzer. Published 1727. Volume I, Volume II Archive.org
- Reprint edition The history of Japan, together with a description of the kingdom of Siam, 1690-92, published 1906. Volume I, Volume II, Volume III Archive.org.
- Engelbert Kaempfer (Wikipedia), also Engelbert Kämpfer or Engelbertus Kaempferus. C 1685 Kaempfer joined the fleet of the Dutch East India Company (VOC) in the Persian Gulf as chief surgeon and in September 1689, arrived in Batavia. In May 1690 he set out for Japan as physician to the VOC trading post in Nagasaki. He was also the author of Amoenitatum exoticarum (Latin language) concerning Japan, published 1712 in (modern) Germany.
- "The Management of the Dutch in India" page 309 An account of the trade in India: containing rules for good government in trade, price courants, and tables: with descriptions of Fort St. George, Acheen, Malacca, Condore, Canton, Anjengo, Muskat, Gombroon, Surat, Goa, Carwar, Telichery, Panola, Calicut, the Cape of Good-Hope, and St. Helena... To which is added, An Account of the Management of the Dutch in their Affairs in India by Charles Lockyer 1711 Archive.org. Contains a brief reference to Siam.
- "Siam" page 51 The New Universal Traveller: Containing a Full and Distinct Account of All the Empires, Kingdoms, and States, in the Known World by J Carver 1779 Google Books
- The View of India Extra Gangem, China, and Japan by Thomas Pennant 1800. Archive.org. Contents. Index. Volume III in a series Outlines of the Globe but sometimes catalogued as Volume III in a series The View of Hindoostan. Includes Siam.
- The Mission to Siam, and Hué, the Capital of Cochin China, in the years 1821-2. From the journal of the late George Finlayson, Surgeon and Naturalist to the Mission. 1826 Archive.org . A Mission sent by the Governor General of Bengal.
- The Modern Traveller: A Popular Description, Geographical, Historical and Topographical, of the Various Countries of the Globe: Birmah, Siam, and Anam 1826. With a Map of Indo-China. The author is catalogued as Josiah Conder. Archive.org.
- The Burney Papers. [Papers relating to Captain H. Burney's mission to Siam in 1825.] vol. 1-vol. 5, pt. 1. Publication Details: Bangkok : Printed by order of the Committee of the Vajirañāṇa National Library, 1910-1914. Henry Burney Wikipedia. He joined the East India Company in 1807.
- Burney Papers Vol.1 To 5 (List Of Contents) 1915. Archive.org version, mirror from Digital Library of India.
- Volume I. nla.gov.au. Consists of V.1, pt.1. Oct. 1825-Apr. 1826.--pt.2. May-June 1826.--pt.3. May-Sept.1826.--pt.4. Feb. 1822-Aug. 1825. However, paging is continuous.
- Volume II nla.gov.au. Part I (January to June, 1825)
- Part II (May 1824 to July 1826)
- Part III (August 1825 to March 1825)
- Part IV (November 1824 to June 1827
- Part V (February 1825 to October 1827)
- Part VI (January 1826 to February 1831)
- Each part is separately numbered.
- Volume III nla.gov.au. V.3, pt.1. Mar. 1827-June 1833.--pt.2. Aug. 1830-June 1840. Page numbering is continuous.
- Volume IV nla.gov.au. Part I (February 1838 to March 1849)
- Part 2 (March 1841 to December 1846)
- Each part is separately numbered.
- Volume V nla.gov.au. Part 1 (Retrospect of British policy from the period of the first establishment of Penang 17th July 1786-1839). Only Part 1 was published.
- The files from nla.gov.au are available to read online, or to download.
- Burney Papers Vol.2; Pt.1 To 3 1911. Archive.org version, mirror from Digital Library of India.
- Burney Papers Vol.4; Pt. 1 To 2 1913. Archive.org version, mirror from Digital Library of India.
- Burney Papers Volume I, Parts I, 2; Volume II, Parts 2, 4; Volume IV, Parts 1, 2, 4 are available at DSpace, National Library of Malaysia, as pdf downloads. Note this website may only be available at certain times and/or is often unavailable due to maintenance. Try again at another time.
- Journal of a Nine Months' Residence in Siam by Jacob Tomlin, Missionary 1831 Archive.org.
- Narrative of a residence at the capital of the Kingdom of Siam : with a description of the manners, customs, and laws of the modern Siamese by Fred. Arthur Neale 1852 Archive.org
- The Land of the White Elephant: Sights and Scenes in South-Eastern Asia : A personal narrative of travel and adventure in Farther India, embracing the countries of Burma, Siam, Cambodia, and Cochin-China. (1871-2) by Frank Vincent Jun. 1874. With numerous illustrations. Archive.org. Also available at Cornell University Library - Southeast Asia Visions in an 1873 edition.
- Straits of Malacca, Indo-China, and China; or Ten Years Travels, Adventures and Residence Abroad by J Thomson 1875 Archive.org. Includes a chapter on Siam.
- A Narrative of Travel and Sport in Burmah, Siam and the Malay Peninsula by John Bradley 1876 Archive.org
- Temples and Elephants: the Narrative of a Journey of Exploration through Upper Siam and Lao by Carl Alfred Bock 1884. With images. South East Asia Visions, Cornell University Library. Note the digital file may be very slow to open. A trip commencing in Singapore in June 1881. Also available British Library Digital Collection with Map
- Eighteen Hundred Miles On A Burmese Tat through Burmah, Siam and the Eastern Shan States by Lieutenant G J Younghusband, Queen’s Own Corps of Guides. 1995 reprint edition, originally published 1888. Archive.org
- To Siam and Malaya in the Duke of Sutherland's Yacht 'Sans Peur' by Florence Caddy 1889 Archive.org.
- Through the Buffer State : a record of recent travels through Borneo, Siam and Cambodia by Surgeon-Major John MacGregor, Indian Medical Service. 1896 Archive.org.
- Notes of a journey on the Upper Mekong, Siam by H Warington Smyth of the Royal Department of Mines and Geology, Bangkok 1895 Archive.org
- Five Years in Siam, from 1891 to 1896 by H Warington Smyth, formerly Director of the Department of Mines in Siam. 1898. With Maps and Illustrations by the author.
- Volume I Archive.org
- Volume I, Volume II HathiTrust Digital Library
- Volume I with General Index Map; Volume II British Library Digital Collection.
- A Padre in Partibus: being notes and impressions of a brief holiday tour through Java, the Eastern Archipelago and Siam ... Reprinted from the “Singapore Free Press.” by G. M. Reith, (George Murray), 1897. Cornell University Library - Southeast Asia Visions. Also available in the British Library Digital Collection
- An English-Siamese Pronouncing Hand-Book. Prepared from the manuscript of the late WH McFarland by the late E H McFarland, revised and enlarged by Geo B McFarland 2nd edition 1900. Archive.org.
- Siam in the Malay Peninsula: a short account of the position of Siam in the states of Kelantan, Patani, Legeh and Siam by R D Davies 1902 Archive.org
- French Indo-China by A Cotterell Tupp. Originally published in Proceedings of the Central Asian Society May 1906. Archive.org. Contains some references to Siam. With a short bibliography at the end.
- Twentieth century impressions of Siam: its history, people, commerce, industries, and resources, with which is incorporated an abridged edition of Twentieth century impressions of British Malaya edited by Arnold Wright 1908 Archive.org
- Bibliotheca Indosinica: Dictionnaire bibliographique des ouvrages relatifs à la péninsule indochinoise [Biblioteca Indosinica: Bibliographic dictionary of books on the Indochinese Peninsula] by Henri Cordier 1912 Archive.org. "Siam" Volume I, page 713-714 digital file page 357. Includes English publications. Contents; Index of authors; Alphabetical Index all volumes.
- Chequered Leaves from Siam by Eric Reid 1913 Archive.org. Some of the sketches first appeared in the newspapers Singapore Free Press, Siam Observer, Ceylon Observer and the Bangkok Times. The author elsewhere is stated to be a former British vice-consul of Siam and editor of the Siam Observer.
- Directory for Bangkok and Siam 1914 "Twenty-Fifth year of publication". Published by The Bangkok Times. Archive.org. Catalogued as "Bangkok and Siam, directory"
- The Directory & Chronicle for China, Japan, Corea, Indo-China, Straits Settlements, Malay States, Siam, Netherlands India, Borneo, the Philippines, &c. For a range of editions to 1922, see China.
- List of Protestant missionaries in China, Japan and Siam for 1874, 1881, 1884, see China.
- Siam by Josiah Crosby, the British consul-general in Bangkok. HMSO 1920. Number 74 in a series of more than 160 studies prepared by the British Foreign Office as background information for British delegates at the 1919 Paris Peace Conference. World Digital Library, Library of Congress.
- Guide to Bangkok: with Notes on Siam by Major Erik Seidenfaden 1927. Link to a pdf download, STOU Digital Repository Sukhothai Thammathirat Open University, Thailand. Note, this website has been noticed to be unavailable at times, possibly it may only be accessible during "office hours".
- Third Edition 1932 With illustrations. Archive.org. Note, to view, select single page option, as the book has been scanned two original pages to one digital page.
- Siam Guidebook: Bangkok, Bang Pa-In, Ayudhya and Lopburi  Archive.org
- From Siam to Suez by James Saxon Childers 1932 Archive.org. The author travelled to Thailand, Singapore, Indonesia, Burma and India.
- Malayan Symphony : Being the Impressions Gathered During a Six Months' journey Through the Straits Settlements, Federated Malay States, Siam, Sumatera, Java and Bali by William Robert Foran 1935. Pdf download, Repositori Digital, National Library of Malaysia. Probably sample pages only.
- Pepper, Rice, and Elephants : a Southeast Asian journey from Celebes to Siam by Ruth Masters Rickover 1975 Archive.org Lending Library
- A Captive on a German Raider by F G Trayes 1918 Archive.org. The author, captured in September 1917, had been in government service for twenty years in Siam, and there is a brief mention of the decorations he had been awarded by the King of Siam page 104-105.
- Multiple editions of Journal of the Siam Society from volume II 1905 to vol XXXI, 1939 (broken range), also vol XLVI, Parts 1-2 June-Nov 1958. Archive.org.
- Index Volume I to XXV Journal of the Siam Society 1935 Archive.org
- Also available online, where articles may be downloaded, from The Siam Society website. A complete series, currently to 2016. (Journals are placed online three years after being published).
- Meet Connie conniemangskau.com. Connie Mangskau was born in Chiangmai, Thailand in 1907 to an English father and Thai mother. At 18 she was married to a Norwegian rubber planter. For her support of the Norwegian community in Thailand, she was later presented with an award.
- "Bangkok Protestant Cemetery" Graving Blog.