This study investigates corporate incentives for the choice of assurance providers of accounting firms versus nonaccounting firms. Based on an international sample of 3,635 firm-year observations for the period of 2010-2014, we find that firms subject to greater legitimacy and stakeholder pressure (e.g., those with higher carbon emissions in countries with stringent climate protection and stakeholder-orientation) are more likely to choose accounting firms as their assurance provider. We also find supporting evidence that firms with a desire to improve carbon management mechanisms (e.g., firms that adopt carbon reduction incentives with higher carbon transparency) show a tendency to choose consulting firms specializing in climate change management. The overall findings suggest that the choice of assurance provider is a strategic decision, which aligns with a firm's overall corporate social responsibility goal. Our results should help practitioners, managers, and regulators understand the emerging audit practice and market.