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Introduction: The increase in prevalence of oral premalignant lesions and oral cancer in India is due to cultural, ethnic, geographic factors and varying lifestyle factors like consumption of tobacco, alcohol and standard of living. Some of the risk factors are modifiable and emphasises the need for detailed assessment of these modifiable risk factors and increasing awareness among general public and policy makers. Aim: The present study was conducted to assess the association between lifestyle factors and Oral Potentially Malignant Disorders (OPMDs). Materials and Methods: A case-control study was conducted where 154 cases and controls were selected from MS Ramaiah Dental College and Hospital, Bangalore and peripheral outreach centers of MS Ramaiah Dental College and Hospital, Bangalore. Cases diagnosed as oral leukoplakia, erythroplakia and Oral Submucous Fibrosis (OSMF) based on the World Health Organisation (WHO) criteria (1980) were included in the study group. Age and sex (1:1) matched controls without OPMDs were included in control group. The data was collected regarding socio-demographic factors, blood group and lifestyle factors using specially designed proforma. Chisquare test and odds ratio were utilised to association and strength of association between various lifestyle factors and development of OPMDs. Univariate logistic regression test was done followed by multiple logistic regression for identifying the risk factors. The p-value