The purpose was to evaluate the intra- and inter-session reliability of hip isometric strength assessment using a frame-stabilized dynamometer (FSD) and to compare the results in the hip adduction (ADD) and abduction (ABD) strength assessment using handheld dynamometer (HHD). Twenty participants (24.2 2.6 years, 69.3 10.0 kg) underwent testing on an FSD (ADD and ABD short and long-lever, internal IR and external rotation ER tests) and using an HHD (ADD and ABD long-lever tests). Analysis revealed excellent (ICC 2.k > 0.90) relative intra-set and inter-set reliability for two visits and good reliability for test-retest results (ICC 2.1 0.79-0.90), regardless of the test. Among the tests, SEM and MDC were the highest for the IR and ER results. In comparison with HHD, long-lever ADD strength was higher and long-lever ABD strength was lower when measured using FSD. Although both measurements have been shown to be highly reliable, the discrepancy between the devices exists.