Classification is the process of grouping similar entities under one category for the case of their comprehension and better handling. The WHO systems of classification is a time - honoured system that has prevailed from decades together and is under constant evolution. Classification of Odontogenic Tumours was formulated by Pieree Paul Broar and has undergone several transformations over 1989 - till 2017. So many entities appear every year in the classification. The study aimed to assess the knowledge , awareness regarding recently revised modification of OT among oral pathologists.A cross sectional, questionnaire based survey study was conducted among 100 oral pathologists around chennai and puducherry population. Ethical clearance was given by the institutional review board and study was conducted over a period of 2 weeks through the questionnaire in google forms and sent in an email link. Questionnaire was divided into various sections based on demographic data, awareness and knowledge along with feedback questions are added in that survey. The statistical analysis done with software 2.1.0 version and microsoft word and excel sheet were used to generate tables and graphs.Of the 100 questionnaires are filled and returned to the response rate of 100%. Majority of the participants fall under the age of 28 - 29 years of about 51% remaining in 24-27 years (34%) with female predominance of 93% (n=93. Majority of the participants were PG residents of about 81%. In that 15% of the participants are not aware about the update version of classification.This survey is first of its kind. From the survey, we conclude that although oral pathologists were aware about OT classification but still most of the PG residents did not have enough knowledge regarding updation in the classification of OT. So, to create awareness regarding odontogenic tumour classification is of utmost importance for oral pathologists as odontogenic tumours are key lesions in diagnosis of oral and jaw swellings.