The report gives a background to Thailand and its timber resources, production and consumption. The history of wood preservation in the country and its modern industrial development are described. Its 19 preservation plants are listed and the production figures of the two major ones given. The wood preservatives in use are noted and the costs of treating a railway sleeper in three different ways compared. The main hazards to Thai timbers, fungal damage, insect damage, and marine borers are detailed and 151 Thai timbers are listed with information on their natural durability and treatability. The organizations in Thailand concerned with the subject are outlined and the report ends by indicating that the future of wood preservation in the country is one of potential.