There is an increasing range of legislative measures introducing mandatory obligations for companies regarding environmental, social and human rights due diligence. Whilst these measures aim to address similar goals and are often rooted in the same international standards, they vary in scope, requirements and terminology. Although some divergence in legislative approaches will naturally reflect differences in domestic priorities, divergence also risks reducing the overall effectiveness of the measures and contributes to a complex environment for companies covered by multiple laws. This policy paper explores opportunities and challenges for different models of international policy co-operation for due diligence measures, considering disclosure requirements, due diligence conduct requirements and product and market-based requirements. It ties into work on the OECD Inclusive Platform on Due Diligence Policy Cooperation.