BACKGROUND: Stroke or brain attack is a sudden loss of neurological function caused by an interruption of the blood flow to the brain. Fullerton Advanced Balance Scale is having ability to measure this. So purpose of this study was to find out reliability and concurrent validity of FAB Scale for assessment of functional balance in post ambulatory stroke patients. OBJECTIVES: (1) To assess intra–rater and inter rater reliability of the Fullerton advanced balance scale for assessment of functional balance in post independent ambulatory stroke patients. (2) To assess concurrent validity of the Fullerton advanced balance scale for assessment of functional balance in post independent ambulatory stroke patients. METHODS: After the ethical approval from committee and Written consent from patients who were willing to participate in study, 30 patients were selected based on inclusion and exclusion criteria. Both the male and female patients, with age group 50 to 65 years were taken for the study. The patients were assessed using FAB Scale by two rater for inter rater reliability and by same rater at different time (24 hours of duration) for intra rater reliability. The patients were also assessed by BBS to find out concurrent validity of FAB Scale. RESULTS: Results was analyzed by using SPSS 20 version for windows software. Intra rater and Inter rater reliability of FAB Scale were assessed by Spearman‘s correlation coefficient (rs). Concurrent validity of FAB Scale and BBS was assessed by Spearman’s correlation coefficient. Spearman correlation coefficient (rs) for intra rater reliability is 0.964** with p <0.01 and for inter rater reliability Spearman correlation coefficient (rs) is 0.972** with p < 0.01. Spearman correlation coefficient (rs) between FAB Scale and BBS is 0.859** with p < 0.01 respectively. CONCLUSION: This study concluded that this test can be useful to clinicians and also FAB Scale is quick to administer (10–12 min), and requires little space and less equipment, so it can be used in clinical setting to assess functional balance.