Background of study: It is estimated that 20 percent of the current global diabetic population resides in South East Asia region. Type 2 diabetes is the commonest form of diabetes globally as well as in India. It constitutes more than 95% of the diabetic population in our country. The number of people with diabetes in India, currently around 40.9 million is expected to rise to 69.9 million by 2025, unless urgent preventive steps are taken. Aim: To assess KAP, risk factors and associated co-morbidities in diabetic patients residing in an urban slum of Mumbai, India Research Methodology: The present community based descriptive epidemiological study was conducted during the period of October 2010 to September 2012. A total of 272 known diabetic patients were selected from the community by employing simple random sampling. Socio demographic profile, knowledge, attitude and practices related to diabetes were collected using of semi-structured, pre-tested questionnaire after taking informed verbal consent. Examinations such as height, weight, body mass index (BMI), blood pressure and blood sugar were done with appropriate techniques. Data was analyzed using SPSS ver. 19 and appropriate tests were applied. Results: Out of 272 patients, 88.2%, 88.7%, 83.8% patients had poor knowledge, attitude and practices scores respectively. A significant association was found between the blood sugar level and body mass index (p__ampersandsignlt;0.05). Similar association was found between practice score and blood sugar level, as subjects with poor scores, had poor glycemic control.