Introduction: Assessment of functional gait ability is one of the key assessment procedures in physiotherapeutic treatment of patients with spinal cord injury. Spinal cord injury functional ambulation inventory (SCI-FAI) is a standardized outcome measure, which includes assessment of kinematics, assistive devices and mobility, specific for this patient group. Purpose: To evaluate intra-, interrater reliability, concurrent validity and ceiling effect of Slovenian translation of SCI-FAI. Methods: 30 patients with incomplete spinal cord injury participated in the study. Reliabiliy was assessed for the part of the instrument with which we assess gait kinematics. Validity and ceiling effect were assessed for part of the instrument with which we assess assistive devices and mobility. We calculated intrarater reliability for five raters. One rater assessed participants on-site for the first evaluation and from the video record for the second one. Other four raters, between which we also evaluated interrater reliability, assessed participants from the video record. We calculated intraclass correlation coefficients (ICC) for both reliability measures. For validity evaluation we calculated Pearsons (r) and Spearmans (ro) correlation coefficients between parts of the instrument and 10 meter walk test, Walking index for spinal cord injury (WISCI) and 6-minute walk test. Ceiling effect was reported as percentage of participants that achieved maximal possible score. Results: Average values on assessments of SCI-FAI kinematics was 18,8 points, SCI-FAI assistive devices 11,9 points, SCI-FAI mobility 4,5 points, on 2-minute walk test 138,3 meters, on fast 10 meter walk test 1,3 m/s, on WISCI 17,6 points and on 6-minute walk test 403,6 meters. We evaluated good intrarater reliability (ICC = 0,821– 0,860) and low (ICC = 0,463) to moderate (ICC = 0,611) interrater reliability. Concurrent validity was good (ro = 0,608–0,621) to excellent (r = 0,976–0,996; ro = 0,794–0,922) depending on the compared outcome measures. 46,6 % participants achieved maximal possible score for assistive devices assessment, 73,3 % for mobility assessment. Conclusion: Our findings are in concordance with authors of the SCI-FAI, that also evaluated good intrarater reliability. Due to low to moderate interrater reliability, we recommend, that gait assessment with SCI-FAI is done by the same physiotherapist before and after treatment. Results of validity and ceiling effect are also in concordance with previous research. Further research should point out the reasons for low to moderate interrater reliability. It would be meaningful to investigate consistency between raters regarding all SCI-FAI kinematics evaluated parameters.