Objective: The aim of this study was to evaluate the concurrent and divergent validity of the Six-Spot Step Test in mild to moderately impaired persons with Parkinson´s disease. Design: Cross-sectional cohort study. Setting: Out-patient clinics. Subjects: Fifty-eight persons with Parkinson’s disease. Main measure: The Six-Spot Step Test, the Timed “Up and Go” test, the mini-BESTest and postural sway was tested on the same day, and the Spearman´s Rank Correlation Coefficient (ρ) was used for data analysis. Results: Subjects had a median age of 68 years (Q1-Q3: 62-73), a median Hoehn and Yahr score of 2.5 (Q1-Q3: 2-3), a median Six-Spot Step Test score of 7.9 s (Q1-Q3: 6.5-9.2), a median Timed “Up and Go” test score of 7.0 s (Q1-Q3: 5.6-7.9), a median mini-BESTest score of 22.5 (Q1-Q3: 19.8-25.0), a median postural sway score of 27.9 mm2 (Q1-Q3: 15.0-53.5) and a median postural sway score of 22.5 mm/s (Q1-Q3: 14.6-39.8). Statistical significant correlations were found between the Six-Spot Step Test and the Timed “Up and Go” test and the mini-BESTest (ρ=0.81 and -0.64, respectively), whereas no significant relations were identified between the Six-Spot Step Test and postural sway (ρ<0.18, P>0.05). Conclusions: The Six-Spot Step Test showed promising concurrent validity to other recommended clinical tests for encompassing balance capacity and capacity of functional mobility, making it a reasonable and easily administered alternative to existing assessment tools when measuring walking ability. As expected, weak correlates to postural sway revealed that, the Six-Spot Step test is not a valid measure of standing balance.