In the present work, the relationship between tool wear and the cutting parameters (cutting speed, V-c; feed, f; depth of cut, a(p)) was investigated in hard part turning operations of cold work tool steel (AISI D2) hardened to 62 HRC up to its core. Ceramic inserts (CNGA 120404 KY4400) were used in the operations. Experimental modeling and analysis were performed after applying a Central Composite Design (CCD), an experimental design tool in Response Surface Methodology (RSM). As well as cutting speed being the most influential factor, decreases in cutting speed and feed were observed to minimize the tool wear. No significance of a(p) on tool wear was encountered through the analysis. In the last part of the work; optimum tool wear values, as well as the cutting parameter values that give these optimum values were determined.