In this study, it was aimed to determine some physical and mechanical properties of Uludag fir (Abies bornmulleriana Mattf.), Oriental beech (Fagus orientalis Lipsky) and Scots pine (Pinus Sylvestris L.) woods impregnated with waste of boron oil. For this purpose, test samples were impregnated with two different methods according to ASTM-D 1413 standards. In the first method, full cell method, for an hour the wood materials were vacuumed for an hour and then they were impregnated under 4 atm for an hour. As for the second method, they were immersed in boron oil for an hour. The results of the experiments show that the highest amount of retention ratio and densities were observed in beech samples. In mechanical strength, the highest bending strength, modulus of elasticity, compression strength and dynamic bending strength were obtained in beech control samples. In conclusion, the wood material should be impregnated by pressure method if waste boron oil is to be used in the fields which will be exposed to physical pressure. Moreover, waste boron oil caused decreasing the mechanical properties as 2% or 5%. However, it is determined that this result is not important for properties of wood materials. According to this wood material could be impregnated by dipping method if it is to be used in the fields which will be exposed to mechanical pressure.