The aim of this work was determining the role of Protein kinase C (PKC) signaling pathway in apoptosis of Leishmania tropica promastigotes, through studying effects of PKC specific inhibitor Staurosporine (STS) on the parasite. Our results showed that treated L. tropica with Staurosporine was enough to inhibit PKC pathway completely, while viability test showed that the concentration of STS to inhibit cell growth by 50% (IC50 = 2.146μM).