Enlarged prostate, either in benign prostatic hyperplasia or prostate cancer is the predominant urological disease affecting older men. Metabolic syndrome including high blood glucose was considered to take part in the development of prostate enlargement, although their association is still unclear. This study aims to investigate the correlation between blood glucose with prostatic-related parameters. A cross-sectional study was conducted involving 91 men with prostate enlargement from Urology Polyclinic, Tabanan Hospital, Bali Province, Indonesia. Prostatic-related parameters collected include patient’s international prostate symptoms score using the questionnaire, prostate-specific antigen and random blood glucose analysis from serum blood sample, and prostate volume determined with transabdominal ultrasonography. Patient’s mean age was 65.4 ± 10 years, mean prostate volume 52.7 ± 26 ml, mean prostate-specific antigen (PSA) 9.2 ± 17 ng/ml, mean international prostatic symptoms score (IPSS) 14.31 ± 7.1, mean random blood glucose 121.1 ± 40.5 mg/dl. This study found weak positive correlation between random blood glucose and prostate volume (r=0.269; p=0.01). PSA and prostate volume showed moderate positive correlation (r=0.365; p<0.001). No correlation between random blood glucose with PSA or IPSS was found in this study. This study found random blood glucose has positive correlation with prostate volume. We recommend enhancing blood glucose control to prevent the progress of prostate enlargement.