The prevalence of obesity continues to increase worldwide day by day causing a serious health problem and impose a significant impact on the National Health Service (NHS) budget. Obesity usually arises from the interactions of multiple genes and lifestyle factors. This study was done to evaluate changes of serum creatinine and creatinine clearance rate in obese female age ranged 30-60 years in comparison to normal healthy female of same age. This study, a cross-sectional analytical type, was carried out in the Department of Physiology, Mymensingh Medical College, Mymensingh between the period from January 2020 to December 2020. A total number of 100 female subjects were included in this study. Among them fifty (50) normal healthy female were taken as control group (Group I) and fifty (50) obese female were taken as study group (Group II). To see the level of serum creatinine determined by Kinetic Colorimetric method and creatinine clearance rate was calculated from serum creatinine by Cockcroft-Gault equation. Data was calculated by unpaired Student's't' test and were expressed as mean (±SD). Pearson's correlation coefficient test was done to find the correlation of serum creatinine and creatinine clearance rate with BMI. In this study we found that mean serum Creatinine and Creatinine clearance rate were higher in obese female in comparison to normal healthy female. Again, serum Creatinine and Creatinine clearance rate were positively correlated with BMI. Therefore, to prevent obesity related complications and leading a healthy life we suggest estimations of these parameters routinely.