This book contains five chapters that detail Tungsten carbides. Chapter One covers applications of Tungsten carbide (WC) and transition metal/Tungsten carbide (M/WC) (M=Pt, Pd, Ag, Au, Ni, Cu, Rh) as heterogeneous catalysts in several processes. Chapter Two attempts to comprehensively summarize the current advances of nanostructured cemented carbide, functionally graded cemented carbide and cemented carbide with an alternative binder to the metal binder phase. Chapter Three analyzes published papers devoted to the research and synthesis of tungsten carbide nanoparticles. Chapter Four presents recent advances in the research and applications of tungsten carbides in micro-electrical discharge machining for titanium alloy machining. Lastly, Chapter Five investigates a finite element approach that has been developed to explore the wear by cracking in cutting tools during machining processes.