The South Thailand insurgency is an ongoing conflict centered in southern Thailand. It originated in 1948 as an ethnic and religious separatist insurgency in the historical Malay Patani Region, made up of the three southernmost provinces of Thailand and parts of a fourth, but has become more complex and increasingly violent since the early 2000s from drug cartels, oil smuggling networks, and sometimes pirate raids.

Southern Thailand, Southern Siam or Tambralinga is a southernmost cultural region of Thailand, separated from Central Thailand region by the Kra Isthmus.