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In this study, the effect of machining parameters on the surface quality of the machining of different surfaces of the Oriental beech (Fagus orientalis Lipsky) tree species used in the woodworking and furniture industry was investigated and it was aimed to determine the optimum machining parameters. The experiments were carried out at two different dept of cut (depth of cut 3.33 mm or 2.5 mm per machining, total 10 mm dept of cut) by using two different 8 mm diameter cutters at 8000, 12000 and 16000 rpm at feed rates of 1000, 1500 and 2000 mm/min. Surface roughness measurements were made according to ISO 4287 by using a test device with the stylus method on the surfaces obtained in different sections. Ra and Rz roughness measurements were performed on the surfaces obtained as a result of machining. It has been observed that the machining parameters have an effect in different rates on the surface roughness and the results are evaluated by comparing with the literature. The lowest average roughness (Ra=5,18 µm) value was obtained in 3-layer processing, 1000 mm/min feed rate at 16000 rpm, cutter type 2 for measurements perpendicular to the fibers on floor surfaces. The lowest values (Ra=2,84 µm) on the side surfaces were obtained as 4-layer machining, 1000 mm/min feed rate at 16000 rpm, cutter type 1 for measurements perpendicular to the fibers.