Whistleblower protection is essential for safeguarding the public interest, for promoting a culture of accountability and integrity in both public and private institutions, and for encouraging the reporting of misconduct, fraud and corruption wherever it occurs. While many countries are increasingly developing legal frameworks to protect whistleblowers, more can be done to mainstream integrity and promote open organisational cultures. This report analyses whistleblower protection frameworks in OECD countries, identifies areas for reform and proposes next steps to strengthen effective and comprehensive whistleblower protection laws in both the public and private sectors.