> Nonprofit hospitals in the US (n = 2343) collectively spent more than $7.8 billion on management consulting services from 2009 to 2023. A stacked difference-in-differences design comparing 306 US nonprofit hospitals that used a management consulting firm for the first time with 513 matched hospitals that did not use a management consulting firm during the study period found little evidence of substantial, statistically significant, or systematic changes attributable to management consulting engagements.