This study investigated the effect of the heat treatment on the wettability of the surface of juvenile teak (Tectona grandis) wood assessed by drop shape analyzer. Heartwood and sapwood samples were heat-treated at 180 and 200 degrees C. Contact angle measurements were done every 5 s for 120 s using a KRUSS DSA100. Heartwood had lower wettability than sapwood. Heat-treatment decreased the surface wettability of both heartwood and sapwood, especially in the wood treated at 200 degrees C. Heartwood had lower wettability than sapwood, even after heat treatment.