As of 2021, the Ministry of Foreign Affairs reports that Thailand has the fourth highest number of Japanese expatriates in the world after the United States, China and Australia.

One of its members, Yamada Nagamasa, rose to prominence as a military advisor to King Songtham, attaining the rank opra.

In 1630 Sri Voravong (later known as King Prasat Thong) sent him to put down a rebellion at Ligor (today Nakhon Si Thammarat).

[17] After the start of the Second Sino-Japanese War in 1937, the Chinese merchant community engaged in a surprisingly violent boycott of Japanese goods.

[18] As relations between Japan and the United Kingdom deteriorated, Japanese expatriates in Singapore and other British territories resettled in Siam to avoid potential internment.

After the war ended, the British military authorities repatriated them all to Japan, including the civilians, unless they could prove that they had been long-term residents of the country.

[24] After the establishment of relations between Japan and Siam in 1898, the Siamese government invited 15 Japanese sericulture experts to develop the country's silk exports.

Though it was a success in building up relations between Japan and Siam, leading to the establishment of Kasetsart University, it failed to increase silk production.

[25] Beginning in 1909, official support from both sides for the project began to wane, and in 1913, after outbreaks of silkworm diseases, funding was cut off.

They occupied the upper end of the economic spectrum, earning salaries ranging from six to twelve times higher than the average Thai corporate worker.

The authors offered health consultations to Japanese expatriates living in the city, and found many suffering from chronic diseases.

It is distributed for free, often in ramen shops along Sukhumvit Road which attract a primarily Japanese clientele.

J-Channel FM 93.75, a 24-hour Bangkok-based radio station, also broadcasts in Japanese roughly 30 percent of the time since 2004.

[39] Ayutthaya's Japanese community was portrayed in the 2010 Thai film Yamada: The Samurai of Ayothaya, starring Seigi Ozeki and Buakaw Por.

[40] A Thai fictional work on the subject of Japanese prostitutes, The memoir of Keiko Karayuki-san in Siam, had its English translation published in 2003.

Thailand is also a strongly Japanophilic country as cuisine, fashion and lifestyle has been sharply influenced by Japanese immigration.