Background: This study was conducted to evaluate Pulmonary function tests in type 2 diabetes mellitus and their association with glycemic control and duration of the disease. Material and methods:This study comprised 100 subjects. 50 subjects had diabetes mellitus while the remaining 50 were controls.Participants with cardio-respiratory, musculoskeletal, or endocrine problems were excluded from the study. To rule out type 2 diabetes, blood glucose levels were tested fasting and postprandially using the glucose oxidase method.Both patients and controls provided informed written consent. All patients were given a questionnaire that included a full personal and medical background.All data were collected using a data collecting form and uploaded to an Excel sheet by two separate data entry operators. Discrepancies in values were rectified by reviewing the data collection form. The clean data was then evaluated statistically. Results:In this study, there were 30 males in diabetic group and 20 males in control group whereas there were 20 females in diabetic group and 30 females in control group. The mean age of the subjects was 52.1+8 and 53.6+7 in diabetic as well as control group, respectively. The mean HbA1c was 6.69+2.5 and the mean duration of diabetes was 5 years. It was discovered that no significant connection (P > 0.05) between the FVC and FEV1 and the length of sickness and HbA1c. Conclusion:Diabetes is a systemic disease that affects the lungs, generating restrictive ventilatory alterations that are most likely caused by glycosylation of connective tissues, diminished pulmonary elastic recoil, and inflammatory changes. It was discovered that glucose levels and disease duration are unlikely to be the primary predictors of lung pathology, necessitating additional investigation.