Highly oriented pyrolytic graphite is a material usually made for specific dimensions, however sometimes the need for altering them may arise. For this reason, it is necessary to choose a suitable technology for machining the material. This study deals with machining a part of highly oriented pyrolytic graphite using wire electrical discharge machining (WEDM). The morphology of the cut and the whole part was then evaluated using both electron and optical microscopy, including microanalysis of chemical composition (EDX). Subsequently, any significant delamination of the surface was studied, with several places differently colored than the rest of the surface.