Oral Lichen Planus(OLP) is a chronic inflammatory disease which has potential to transform into a malignancy mainly into squamous cell carcinoma. This study was done to evaluate the prevalence of erosive OLP among all OLP cases in a particular ethinic group of people. Materials and method :Data retrieved was from 86000 case sheets from saveetha dental college. The case sheets showed 94 patients with OLP. Most of the patients were in the age group of 50-60 years with a female predominance. 48 patients were erosive OLP variant. A chi square analysis showed erosive OLP had a tendency to occur more in the buccal mucosa(p<0.05). A chi square analysis to compare gender was not significant(p>0.05) This study shows that there is more prevalence of erosive OLP with a female predominance and affecting the buccal mucoa.