Syburi (Thai: ไทรบุรี;[2] RTGS: Sai Buri, meaning "City of the Banyan") is the name for the Malay state of Kedah returned to Thailand when the Japanese occupied British Malaya during World War II.

As a reward for entering into a military alliance with the Japanese, the latter agreed to return to Thailand the four Malayan provinces ceded to the British in 1909, Kedah, Perlis, Kelantan, and Terengganu, as well as parts of Shan State in British Burma.

[4][5] In July 1943, Japanese Prime Minister Hideki Tojo announced that Kedah (along with Perlis, Kelantan and Terengganu) were to be returned to Thailand as part of the military alliance signed between Thailand and Japan on 21 December 1941.

From 18 October 1943 until the surrender of the Japanese at the end of the war, Kelantan, Terengganu, Kedah and Perlis were under Thai administration.

[6] Administrative services were carried out by Thai civil servants who were under military supervision.