Research background. Iliotibial band syndrome is common among athletes due to intensive training or repetitive knee flexion and extension. There is not much data about iliotibial band length onthe measurement reliability in the literature.Research aim was to investigate the links and the reliability of Ober’s test and Modifed Ober’stest results measuring iliotibial band length using goniometer and inclinometer.Methods. Ober’s test and Modifed Ober’s test were performed for the estimation of iliotibialband length, and the flexion angles were measured using a standard goniometer and an inclinometer.Results. Research results indicated that the values of intraclass correlation coeffcient were withinthe range of 0.85–0.94, so the measurement reliability (reproducibility) of Ober’s test and ModifedOber’s test were estimated as good or very good.Conclusions. In Ober’s test and Modifed Ober’s test iliotibial band length can be reliably measured using both goniometer and inclinometer. The results of goniometric and inclinometric measurements of iliotibial band length in both Ober’s test and Modifed Ober’s test are reliable and theirreproducibility is adequate.