ObjectiveThis study aimed to develop and validate a Decision‐Making Ability Scale (DMA‐S) for postpartum urinary incontinence (PPUI) women engaging in pelvic floor physical therapy (PFPT).MethodsItems were created in line with a review of the literature and exploratory qualitative study with 22 women. The items were submitted for expert opinion and a pilot implementation was made with 58 women with PPUI. Furthermore, the construct validity of the scale was tested with exploratory factor analysis (EFA) (n = 220) and confirmatory factor analysis (CFA) (n = 240). Internal consistency for the Chronbach's α and test–retest reliability for the intraclass correlation coefficient (ICC) were also investigated for the DMA‐S in the study.ResultsThe results of the EFA indicated a Kaiser–Meyer–Olkin value of 0.85 and Bartlett's test of sphericity showed a χ2 value of 8352.101, p < 0.001. After removing one item with factor loading values below 0.50, the resulting factor structure accounted for 83.38% of the total variance. The fit indices of the scale model tested in the CFA were determined as χ2/df = 1.08 < 3, root mean square error of approximation = 0.018 < 0.08, comparative fit index = 0.996 > 0.90, Tucker–Lewis index = 0.995 > 0.90, goodness‐of‐fit index (GFI) = 0.933 > 0.90, adjusted GFI = 0.916 > 0.90, and incremental fit index = 0.996 > 0.90. The Cronbach's α values were 0.95–0.97 for the subdimensions of the scale and 0.93 for the total scale. Data also showed a good test–retest stability (ICC = 0.984).ConclusionThe DMA‐S is a reliable and valid tool for assessing the decision‐making ability for PPUI women engaging in PFPT.