In this study, the effect of pine cone ratio on wettability and surface roughness of particleboards was examined. Contact angles of water on the produced samples were measured with a goniometer. The surface roughness of the samples was determined with a fine stylus tracing technique. Particleboards made from 100% wood particle had the lowest average contact angle (95.6 degrees), but the highest was for the particleboards containing 50% pine cone (116.3 degrees). Average surface roughness was higher for samples containing a higher amount of pine cone in the mixture. The smoothest surface (9.77 mu m R-a) was observed when panels were produced using 100% wood particles. On the other hand, the roughest surface (15.50 mu m R-a) was found for the samples containing 50% cone particles in the mixture. R-max and R-z parameters had similar trends to the R-a values. Increasing the pine cone ratio in the mixture negatively affected the contact angle and surface roughness parameters of the particleboard.